Photoletter to the editor: Scarring alopecia resulting from pyoderma gangrenosum of the scalp.

Pyoderma gangrenosum is an uncommon ulcerative cutaneous condition of uncertain aetiology. It is a disease that causes tissue to become necrotic, leading to deep ulcers. We report a case of pyoderma gangrenosum localized at the scalp, which is an unusual location.