Mucormycosis, also known as black fungus, is a serious fungal infection, usually in people with reduced ability to fight infections. Symptoms depend on where in the body the infection occurs. It most commonly infects the nose, sinuses, eye and brain resulting in a runny nose, one sided facial swelling and pain, headache, fever, blurred vision, swollen and bulging eye, and tissue death. Other forms of disease may infect the lungs, stomach and intestines, and skin.