A 42-year-old woman was referred to our department for possible melanoma on the left thigh. She presented with a 2-year history of a dark papule that progressively grew larger, and 3 weeks before presentation also with an associated red halo and pruritus. Physical examination revealed a symmetric erythematous halo around a central, ill-defined, firm, dark-blue to black papule, 5 mm in diameter (Fig 1, A).
