||Pyoderma gangrenosum is a rare condition of spontaneous ulceration of the skin. This disease is associated in 50% of cases with various systemic disesases such as ulcerative colitis, chronic rheumatoid polyarthritis, or myelogenous leukemia.
The lesions usually begin as pustules or fluctuant nodules over which the skin breaks down, with subsequent ulceration.
The cause of this disease is unknown; however, in most patients abnormal immunoglobulins, especially IgA, can be detected. Good results can be obtained with corticosteroids.
This young male adult with ulcerative colitis underwent spontaneous ulceration of the skin just in front of his left ear.