Amelanotic superficial spreading malignant melanoma mimicking Bowen's disease.

A 67-year-old woman presented with a scaly, erythematous plaque, for which a clinical diagnosis of Bowen's disease was made. However, incisional biopsy established the diagnosis of amelanotic superficial spreading malignant melanoma. Biopsy thus avoided the use of inappropriate destructive therapy, such as cryotherapy or cautery. This case illustrates the importance of obtaining a histological diagnosis, prior to treatment, in suspected cases of Bowen's disease.