Pilomatricoma: an alarming presentation.

Pilomatricoma is an uncommon, benign growth with origination from the hair matrix that may have several clinical presentations and is frequently misdiagnosed. This case of a rapidly growing pilomatricoma in a 26-year-old was particularly deceptive, generating a differential diagnosis, principally of malignant tumors. The typical features, variants, histogenesis, differential diagnosis, and therapy are reviewed.