Subungual melanoma in situ: two independent streaks in one nail bed.

We report an unusual case of two nail-bed streaks under one nail, revealing melanoma in situ affecting the nail bed and plate, but not the nail fold. This unusual mode of presentation together with the absence of any nail-fold involvement has not been reported previously. We highlight the need for early histological assessment of nail-bed lesions and discuss subungual melanoma.