Thick, yellow-brownish, ulcerated crust on the scalp (15 x 10 cm) mimicking basal cell carcinoma. Mechanical removal of the crust. Ortho and parakeratotic horn material intermingled with bacteria ...

F.G. Bechara, MD, is a Member of the Department of Dermatology and Allergology, Ruhr-University, Bochum, Germany. S. Rotterdam, MD, is a Member of the Department of Dermatology and Allergology ...