Clinical manifestation

Occurs most commonly on the trunk in white males and the lower legs and back in white females, in pigmented races; most common sites are plantar foot, subungual, palmar, and mucosal sites Superficial spreading subtype: most common, occurring in approximately 70% of patients; a flat or slightly elevated papule or plaque, with variegate pigmentation (black, brown, blue, or pink discoloration), usually greater than 6 mm in diameter; irregular asymmetric borders

Nodular subtype: most commonly seen on the legs and trunk; rapid growth of a dark

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