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Author: Don Stader, M.D. Educational Pearls Mucor/Rhizopus fungal infections usually present in diabetic or immunocompromised patients as a black, necrotic lesion on the face. The fungus invades the vasculature of the face, causing tissue ischemia and necrosis. The infection is more common in the diabetic population because the fungus prefers more acidic and glucose-rich environments. This is a surgical emergency since it is cured only with excision of the affected tissue References: Vijayabala GS, Annigeri RG, Sudarshan R. Mucormycosis in a diabetic ketoacidosis patient. Asian Pacific Journal of Tropical Biomedicine . 2013;3(10):830-833. doi:10.1016/S2221-1691(13)60164-1.