Necrosis: Types, Symptoms, Causes and Treatment Options

Necrosis is the condition in which living tissues are irreversibly damaged, resulting in cell death. The integrity of the cell membrane is disrupted, cellular contents spread into surrounding tissues, and an inflammatory reaction develops. This process differs from apoptosis because it represents uncontrolled cell death and can lead to serious tissue loss.

The causes of necrosis include infections, trauma, vascular occlusions, toxic substances, and radiation. Ischemic necrosis, which develops as a result of reduced blood flow, is the most common type. In addition, chemical burns, drug reactions, or surgical complications can also cause necrotic changes in tissues.

Symptoms vary depending on the affected tissue but generally include pain, bruising, foul odor, discoloration, and loss of sensation. When necrosis occurs in the skin, the area may turn black; in internal organs, loss of function, fever, and signs of infection may be observed. In advanced cases, there is also a risk of sepsis.

Treatment is planned according to the cause and extent of necrosis. In the initial stage, restoring blood circulation, controlling infection, and surgically removing necrotic tissue (debridement) are essential. When necessary, antibiotics, oxygen therapy, or reconstructive surgery may be applied. Early diagnosis is critically important to minimize tissue loss.

What does necrosis mean?

In its simplest definition, necrosis is the chaotic and uncontrolled death of cells or tissues in our body as a result of unexpected damage. You can think of it like a city’s power plant suddenly exploding. Everything stops at once and without planning. This condition is usually triggered by unexpected and destructive external factors such as interruption of blood flow to the tissue (ischemia), severe infection, physical trauma, or exposure to toxic substances. Necrosis is always a harmful, pathological process for the body and, if left untreated, can spread and lead to serious consequences.

Here, it is very important to understand the fundamental difference between necrosis and apoptosis, another mechanism used by the body for healthy functioning. Apoptosis is known as “programmed cell death.” It is the planned, orderly, and almost silent elimination of aged, damaged, or no-longer-needed cells by the body. It can be likened to the controlled demolition of a building without scattering debris or harming the surroundings. During apoptosis, cells shrink, break into orderly packages, and these packages are quietly engulfed by surrounding scavenger cells. Therefore, apoptosis does not cause inflammation and is an indispensable process for the body’s renewal and maintenance of health.

Necrosis, on the other hand, is a very “noisy,” chaotic, and inflammatory event. Cells swell uncontrollably and burst like balloons. As a result of this rupture, all the chemicals, enzymes, and waste products inside the cell spill into the surrounding tissue. The body perceives this situation as an alarm or an “invasion” and immediately sends defensive cells (white blood cells) to the area. The result is the classic signs of inflammation (inflammation) that we are all familiar with. This secondary inflammatory reaction is not limited to the dead tissue alone; it can also damage the surrounding healthy tissues, causing the necrotic area to grow like an avalanche. That is why, in combating necrosis, it is not enough to eliminate only the primary cause; breaking this secondary cycle of damage is also of vital importance.

The main differences between necrosis and apoptosis are as follows:

• The cellular response in necrosis is swelling and rupture, whereas in apoptosis it is shrinkage and fragmentation.
• Necrosis always occurs as a result of pathological damage.
• Apoptosis is generally a physiological, that is, normal process.
• In necrosis, cell membrane integrity is lost early.
• In apoptosis, cell membrane integrity is preserved until the final stage.
• Necrosis causes a severe inflammatory reaction.
• No inflammatory reaction is seen in apoptosis.
• Necrosis affects a wide area of tissue.
• Apoptosis usually affects individual cells.

Why and how does a tissue die?

For a cell to survive, it needs continuous energy (ATP in medical terms), a balanced internal environment, and most importantly, a strong cell membrane that protects it from the outside world. The process leading to necrosis is usually a domino effect that begins with the collapse of one of these fundamental pillars. We can view this process as a tragic end experienced by a cell. Let us examine these steps more closely.

The process usually begins when the mitochondria, the cell’s power plants, fail to produce sufficient energy. Especially when blood flow to a tissue is interrupted (a state of hypoxia), energy production comes to a halt because oxygen does not reach the cells. Energy is critical for operating small but vital pumps such as the sodium-potassium pump in the cell membrane. These pumps regulate the ion balance between the inside and outside of the cell like a dam.

When energy is cut off, these pumps stop working. The balance of sodium, potassium, and water inside and outside the cell is completely disrupted. Sodium, which normally should be largely kept outside the cell, along with water, rushes uncontrollably into the cell. As a result, the cell begins to swell like a balloon filled with water. This is the first and sometimes reversible stage of damage if intervention is timely.

However, as the process progresses and the cell membrane is damaged due to this swelling, calcium—which normally exists at a very high concentration outside the cell—rushes inward. This abnormal and sudden increase in intracellular calcium acts like a “panic button.” It activates a series of destructive enzymes (such as phospholipases and proteases) that had been dormant. These enzymes turn into monsters, ruthlessly breaking down the cell’s membranes, cytoskeleton, and other essential components. This point is generally considered the irreversible “point of no return.” There is no longer any hope of rescue for the cell. With the activity of destructive enzymes and increasing cellular swelling, the cell membrane can no longer withstand the pressure and ruptures. The entire contents of the cell spill into neighboring tissues, triggering the severe, damaging inflammatory reaction described earlier.

The steps of this vicious cycle leading to cellular collapse are as follows:

• Cessation of energy (ATP) production
• Failure of cell membrane pumps
• Uncontrolled sodium and water influx into the cell
• Cell swelling (oncosis)
• Excessive calcium influx into the cell
• Activation of destructive enzymes
• Breakdown of the cytoskeleton and organelles
• Complete rupture of the cell membrane (lysis)
• Spillage of cellular contents into the surroundings, triggering inflammation

Are there different types of necrosis?

Necrosis can present in different forms depending on the causative factor and the type of tissue affected. Recognizing these differences as a physician is very important for understanding the underlying problem and planning the correct treatment. Let us examine the most commonly encountered types and their characteristics in the head and neck region.

Coagulative Necrosis: This is the most classic type of necrosis seen as a result of interruption of blood flow (ischemia) in all solid organs except the brain. The key point here is this: the lack of oxygen is so severe and sudden that it “cooks” and inactivates not only the structural proteins of the cell but also the destructive enzymes responsible for self-digestion. Therefore, the tissue does not immediately liquefy and retains its basic structure like a ghost for some time. The affected tissue becomes pale, firm, and swollen. This is the picture we see at the tip of a skin flap with impaired circulation after a facelift surgery or in cases of “dry gangrene.”

Typical features of coagulative necrosis are:

• Main cause: Severe ischemia (reduced blood supply)
• Appearance: Firm, pale, cooked-like
• Tissue structure: Preserved for a period of time
• Clinical example: Surgically compromised skin flap

Liquefactive (Liquefaction) Necrosis: In this type, dead cells are completely digested by enzymes, and the tissue turns into a liquid, viscous mass. This digestion occurs either through powerful enzymes secreted by microbes such as bacteria or through secretions from the body’s own defense cells (neutrophils) that accumulate at the site of infection. The tissue architecture is completely lost and is usually replaced by pus, a creamy yellow inflammatory fluid. A facial abscess, untreated dental infections, or a peritonsillar abscess are examples of this type of necrosis. One of the most frightening examples is necrotizing fasciitis, in which bacterial enzymes rapidly dissolve the deep tissue layers of the neck.

Typical features of liquefactive necrosis are:

• Main cause: Bacterial infections or enzymatic digestion
• Appearance: Liquid, creamy, purulent
• Tissue structure: Completely lost
• Clinical example: Abscess, necrotizing fasciitis

Caseous (Cheese-like) Necrosis: This is a very specific type of necrosis almost entirely associated with tuberculosis (TB) infection. It is actually a mixture of coagulative and liquefactive necrosis. It occurs when the immune system attempts to wall off the resistant tuberculosis bacteria within a structure called a “granuloma.” As the name suggests, the affected tissue grossly appears white, soft, friable, and has the consistency of cottage cheese or cream cheese. In cases of tuberculosis-related enlargement of neck lymph nodes (commonly known as scrofula), this characteristic cheese-like material is seen upon biopsy.

Typical features of caseous necrosis are:

• Main cause: Tuberculosis (TB) infection
• Appearance: White, soft, cheese-like
• Tissue structure: Amorphous, shapeless debris within a granuloma
• Clinical example: Cervical lymph node tuberculosis (scrofula)

Fat Necrosis: This is localized damage to adipose (fat) tissue. In the facial region, the most relevant cause is trauma. After a blow to the face or a surgical procedure (such as a facelift), fat cells may rupture and release lipase enzymes. These enzymes break down fat into fatty acids. These fatty acids then combine with calcium in the tissue to form solid, chalky structures through a reaction called “saponification.” This can present as a firm, painless nodule palpable in the face and may sometimes be confused with other pathologies.

Typical features of fat necrosis are:

• Main cause: Trauma or enzymatic fat breakdown
• Appearance: Firm, chalk-white nodules
• Tissue structure: Dead fat cells surrounded by calcium deposits
• Clinical example: Firm nodules on the face after surgery or trauma

What are the symptoms of tissue necrosis?

The process of tissue death can begin insidiously and progress rapidly. The most critical point is to recognize this process at the earliest stage, before it becomes irreversible. Symptoms usually show a progression, and correctly interpreting these signs provides a valuable time window to save the tissue.

Early Stage (Potentially Salvageable Tissue): At this stage, the tissue can be saved with rapid and appropriate intervention.

Here are the initial warning signs to watch for:

• Disproportionate Pain: Severe, persistent, progressively worsening pain that is much more intense than the expected normal soreness after surgery or a procedure and does not respond to standard painkillers.
• Sudden Pallor/Whitening: Especially after a filler injection, the sudden appearance of a sharp, porcelain-like whitening of the skin. This is the most urgent sign of arterial occlusion supplying the tissue.
• Coolness: The affected area feels noticeably colder to the touch compared to adjacent healthy tissues. This is physical evidence of reduced blood flow.
• Delayed Capillary Refill: Prolongation of the time it takes for color to return to normal after pressing and releasing the tissue with your finger (usually longer than 2 seconds).
• Advanced Ischemia (Necrosis Imminent): This stage is the final call for emergency intervention.

The signs of this critical period include:

• Purple Discoloration: As blood flow stagnates, deoxygenated blood pools in the tissue. This leads to a dull, purplish, violet discoloration of the skin.
• Mottled Appearance (Livedo Reticularis): Sometimes, a lace-like, netted pattern of purplish discoloration appears around the affected area. This is a very important sign that circulation is severely compromised and necrosis is imminent.
• Abnormal Swelling: A firm, tense, progressively increasing swelling, distinct from the mild edema expected after a procedure.
• Irreversible Necrosis (Established Tissue Death): At this stage, the tissue is already dead, and treatment focuses on preventing further spread of damage and repair.

Findings of this final stage include:

• Blister Formation (Bullae): The damaged upper skin begins to separate from the underlying layers, forming blisters filled with clear, bloody, or purulent fluid.
• Black Scab (Eschar) Formation: The definitive and final sign of full-thickness tissue death is the formation of a dry, hard, leathery black scab. This tissue has completely lost its viability.
• Loss of Sensation: The area, which was initially extremely sensitive and painful, becomes completely numb as the cutaneous nerves die.
• Foul Odor and Discharge: A bad smell emanating from the area is an important indicator of advanced necrosis and superimposed bacterial infection.

Why does the risk of necrosis increase in surgeries?

Surgical procedures performed in the face and neck region inherently cause temporary disruption of tissue blood supply. As surgeons, our top priority is to recognize these risks and meticulously plan to minimize them in order to prevent necrosis. There are certain situations during surgery that can jeopardize blood supply:

The main surgery-related risk factors are:

• Hematoma: Accumulation of blood at the surgical site.
• Excessive Tension: Excessive tightness along the suture line.
• Improper Flap Design: Elevating the skin flap too thin.
• Incorrect Surgical Planning: Injury to the vascular network supplying the skin.
• Excessive Tissue Removal: Weakening of the tissue’s blood supply.

The most common complication after facelift surgery and the number one cause of skin flap necrosis is hematoma. Blood accumulation (hematoma) at the surgical site exerts pressure from below on the thin skin flap like a water balloon, compressing its delicate vascular network and impairing blood flow. Therefore, postoperative bleeding control and drainage of accumulated blood are extremely important. Another critical mistake is closing a wound under excessive tension. Tension along the suture line compresses the capillaries at the very tip of the flap like a vise, causing that area to die. This is why, in surgeries such as facelifts, it is vital that tension be borne by the deeper supporting layer known as the SMAS rather than the skin itself.

Who is at higher risk for necrosis?

Certain personal conditions and lifestyle habits significantly increase the risk of necrosis by reducing the body’s healing capacity. Therefore, it is extremely important to fully share your entire medical history and habits with your doctor during the preoperative consultation.

The main personal factors that increase the risk of necrosis include:

• Smoking and Nicotine Use: All nicotine products (cigarettes, e-cigarettes, cigars, hookah, nicotine patches/gum).
• Uncontrolled Systemic Diseases: Especially hypertension and diabetes.
• Vascular Diseases: Atherosclerosis (hardening of the arteries) or other circulatory disorders.
• Blood Thinners: Aspirin, clopidogrel, warfarin, and newer-generation anticoagulants.
• Previous Radiotherapy: Especially radiation therapy to the head and neck region.
• Nutritional Disorders: Particularly protein deficiency.
• Weakened Immune System: Due to various diseases or medications.

Among these factors, smoking and all forms of nicotine use represent the single most important and modifiable risk factor for wound healing complications and flap necrosis. Nicotine is a potent vasoconstrictive toxin that severely narrows the microcirculation—the finest capillaries that nourish tissues. Even smoking a single cigarette can reduce blood flow to the fingertips by up to 40% for hours. Thousands of other toxins in cigarette smoke also impair oxygen delivery to tissues and disrupt the function of healing cells. For a patient scheduled for surgery, completely stopping all nicotine products, including cigarettes, at least 4 weeks before and 4 weeks after surgery is a non-negotiable rule for a successful outcome. It should be remembered that these risk factors do not act independently but synergistically, multiplying each other’s effects. For example, the risk for a patient who smokes and also has hypertension is far greater than the simple sum of these two risks.

How do facial fillers cause necrosis?

Yes, although rare, this is the most feared and devastating complication of filler applications. The mechanism operates in two main ways: either the filler material is accidentally injected directly into an artery, instantly blocking it like a plug, or an excessive amount of filler is injected adjacent to the artery, compressing it from the outside and stopping blood flow. In both cases, the result is the same: the tissue supplied by that artery becomes ischemic and rapidly begins to die.

There are certain high-risk anatomical regions on the face in terms of vascular occlusion. These are areas where major arteries run close to the surface and where fillers are commonly injected.

• Glabella (between the eyebrows): Supratrochlear and supraorbital arteries.
• Nasal dorsum and tip: Dorsal nasal artery.
• Nasolabial folds (nose-lip lines): Angular and facial arteries.
• Forehead region: Branches of the supratrochlear and supraorbital arteries.
• Chin tip: Mental artery.

To prevent this frightening complication, the practitioner must have a thorough three-dimensional understanding of facial vascular anatomy, use blunt-tip cannulas instead of needles in high-risk areas to reduce the likelihood of vessel penetration, inject slowly, use small volumes, and perform aspiration (pulling back on the syringe to check for blood) before injection to confirm that the tip is not within a vessel. Management of this complication requires urgency and should only be performed by experienced physicians.

Are there necrosis conditions specific to the head and neck region?

Beyond surgical complications, there are also certain special and serious conditions encountered by Otolaryngology and Head and Neck Surgery specialists in which the disease itself progresses with necrosis. These usually arise as a consequence of another underlying disease and require specialized management.

Two important necrotic conditions specific to this region are:

• Osteoradionecrosis (ORN) of the Jaw: This is a very serious complication that can occur years later in patients who have received high-dose radiotherapy (radiation therapy) for head and neck cancers. Radiation gradually dries out and occludes the small vessels supplying the jawbone, like tree roots withering (obliterative endarteritis), leaving the bone avascular, acellular, and hypoxic. In this state, the bone’s ability to repair and regenerate is nearly eliminated. Often, a simple trauma such as a tooth extraction performed on this fragile and defenseless bone exceeds its limited healing capacity and triggers ORN. It manifests with severe pain, swelling, and exposed dead bone visible inside the mouth. The best prevention is a comprehensive dental examination and completion of all necessary treatments before radiotherapy.
• Necrotizing Fasciitis of the Neck: This is a terrifying, potentially fatal infection that spreads very rapidly along the deep fascial planes (thin membranes surrounding muscles and organs) of the neck and is usually caused by multiple microorganisms (polymicrobial). It often begins from a source such as an untreated infected molar tooth or an untreated peritonsillar abscess. Initially, it may resemble a simple skin infection or abscess, but the most important and classic clue is severe pain disproportionate to the visible skin findings. As the infection rapidly progresses in the deep planes, the skin becomes first red and tense, then purple, and finally black, and as the cutaneous nerves die, it becomes numb. This condition requires emergency and highly aggressive surgical intervention.

What are the first steps in treating necrosis?

Especially suspicion of vascular occlusion developing after a hyaluronic acid–based filler application is a medical emergency, where even seconds can be vital. The goal is to restore blood flow as quickly as possible before tissue death occurs. A “wait and see” approach can lead to disaster in this situation.

The emergency intervention protocol for suspected filler-related vascular occlusion includes the following steps:

• Immediately stop the injection.
• Apply vigorous massage to the area.
• Apply warm compresses to the area.
• Immediately and without delay contact the physician who performed the procedure.
• High-dose injection of hyaluronidase enzyme by the physician.
• Repeat hyaluronidase injections hourly if necessary.
• Initiate aspirin therapy as supportive treatment.
• Use topical vasodilator creams if necessary.
• Start antibiotics to prevent secondary infection.
• Refer urgently for Hyperbaric Oxygen Therapy if necessary.

These initial steps only buy time. The primary and only effective treatment is an enzyme called hyaluronidase. This enzyme breaks down hyaluronic acid molecules, dissolving the filler and relieving the vascular blockage. It must be administered without any delay, at high doses, using the correct technique, and only by an experienced physician as soon as suspicion arises. Sometimes a single session is not sufficient, and repeated injections over hours may be required until tissue color returns to normal. Therefore, filler procedures must be performed by physicians who are equipped and knowledgeable to manage such emergencies, in clinical settings with appropriate emergency equipment.

How is advanced necrosis treated?

Once tissue has died and a black scab (eschar) has formed, it is unfortunately impossible to revive that tissue. At this point, treatment focuses on preventing further spread of damage, controlling infection, and preparing the wound bed for future reconstruction.

The basic treatment principles at this stage are:

• Surgical Debridement: Dead tissue is an ideal breeding ground for bacteria and completely inhibits the body’s healing mechanisms, so surgical removal is essential. This procedure is called “debridement.” The goal is to meticulously remove all dead, nonviable, and infected tissue, like a sculptor, until healthy, bleeding tissue margins are reached. This both prevents systemic spread of infection (sepsis) and prepares the wound bed for healing or the next stage of reconstruction.
• Appropriate Wound Care: The cleaned wound must be regularly monitored with modern wound care products and dressings that support healing.
• Antibiotic Therapy: Broad-spectrum antibiotics are usually administered intravenously or orally to control infection systemically.

Advanced Treatment Methods:

• Hyperbaric Oxygen Therapy (HBOT): In this therapy, the patient breathes 100% pure oxygen inside a special pressure chamber. As a result, the oxygen level in the blood increases to 10–20 times normal. This oxygen dissolved in plasma can reach ischemic tissues with impaired blood flow—even those beyond the reach of capillaries—by diffusion. HBOT is a powerful adjunctive treatment for salvaging compromised flaps or tissues, reducing edema, stimulating new vessel formation, and combating bacteria that thrive in oxygen-poor environments.
• Negative Pressure Wound Therapy (Vacuum Therapy – NPWT): This is used especially in the management of large, exudative wounds with extensive tissue loss. A special sponge is placed over the wound, sealed with an airtight film, and connected to a device that applies controlled, continuous or intermittent negative pressure (vacuum) to the wound bed. This system acts like a vacuum cleaner, removing excess fluid and infected material, reducing edema, increasing blood flow, and accelerating the formation of new, healthy tissue (granulation tissue) in the wound bed. It is often used after extensive surgical debridement to prepare the wound for definitive reconstruction.

F.A.Q

Dr. Yunus Kaplan

Op. Dr. Yunus Kaplan is a  ENT surgeon with over 15 years of experience specializing in facial aesthetics and rhinoplasty in Istanbul, Turkey. A graduate of Gaziantep University Faculty of Medicine, he completed his ENT specialization at the same institution in 2009 and has since practiced in several prominent private hospitals before founding his own clinic in 2016. Dr. Kaplan focuses on primary, revision, ethnic, and piezo rhinoplasty procedures, combining precision and natural results. He is an active member of the European Academy of Facial Plastic Surgery (EAFPS), the Turkish Facial Plastic Surgery Society, and the Head and Neck Surgery Society, maintaining high standards of medical ethics, artistry, and patient trust.