Black fungus is a common term often used to describe mucormycosis, a rare but serious fungal infection caused by a group of molds called mucormycetes. The infection can affect the sinuses, lungs, skin, or other parts of the body. When it affects the sinuses, it can sometimes spread to tissues around the eyes and, in severe cases, the brain.

It is important to understand that “black eye fungus” is not a standard medical diagnosis. A black eye usually refers to bruising around the eye, while “black fungus” generally refers to mucormycosis.
What Causes Black Fungus?
Mucormycosis occurs when certain environmental molds cause an infection, usually in people who are particularly vulnerable. Mucormycetes are found naturally in the environment, including in soil and decaying organic material.
People can become infected by breathing in fungal spores. Some forms of mucormycosis can also occur when spores enter damaged skin or wounds. The infection does not normally spread from person to person.
The risk is higher among people with significantly weakened immune systems or certain underlying health conditions. Risk factors can include uncontrolled diabetes, some cancers, organ or stem-cell transplantation, prolonged corticosteroid use, and severe immune suppression.
What Are the Symptoms?
Symptoms depend on which part of the body is affected. When mucormycosis involves the sinuses and tissues around the eye, possible symptoms can include:
Fever
Headache
Nasal or sinus congestion
Facial swelling, particularly on one side
Facial or sinus pain
Eye pain or swelling
Vision changes
Dark or black areas of damaged tissue around the nose or inside the mouth
Symptoms can become serious quickly in some cases. For this reason, suspected mucormycosis requires prompt medical evaluation.
How Is Black Fungus Diagnosed?
There is no reliable way to diagnose mucormycosis based on symptoms alone. Healthcare professionals may evaluate a person's medical history and symptoms and may use laboratory testing of tissue or fluid samples. Imaging tests such as CT or MRI scans may also be used to determine whether the infection has affected surrounding structures.
How Is It Treated?
Mucormycosis requires medical treatment. Treatment may involve prescription antifungal medication, and surgery may sometimes be necessary to remove infected or damaged tissue. The specific treatment depends on the location and severity of the infection and the person's overall health.
Early recognition and treatment are important because mucormycosis can become severe.
Important Facts About Black Fungus
Not every dark, swollen, or painful area around an eye is mucormycosis. Bruising, allergies, bacterial infections, injuries, and other conditions can cause similar-looking symptoms.
People should not try to diagnose or treat suspected mucormycosis at home. If someone develops rapidly worsening facial or eye swelling, vision changes, severe facial pain, or unusual dark tissue around the nose or eye, they should seek urgent medical attention.
Bottom Line
Black fungus usually refers to mucormycosis, a rare but potentially serious fungal infection. It is associated mainly with certain medical risk factors and weakened immune defenses. Because symptoms can overlap with other conditions and the infection may progress quickly, professional medical evaluation is essential. The term should not be confused with an ordinary black eye or bruise.
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