Dermoscopic evaluation of nonpigmented lesions: Amelanotic melanoma and basal cell carcinoma

Amelanotic melanoma (A) and basal cell carcinoma (B). Using the "prediction without pigment" algorithm, dermoscopy reveals ulceration (B), white clues (A, B), and polymorphous vessels (A, B). Thus, with any of these structures, a biopsy should be performed.