Mucormycosis is an infrequent fungal infection This infection is difficult to diagnose and treat and have a high morbility and mortality and affects immunocompromised patients, especially those patients with decompensated diabetes mellitus. We report the case of a 60 years old diabetic patient with poor metabolic control who was admitted for diabetic ketoacidosis and days later present right periorbital swelling and pain, is diagnosed of mucomycosis and is successfully treated with amphoterin B and surgery.