DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Close-up of the toenail of a 63 year old female patient, showing longitudinal melanonychia, a nail discolouration caused by melanin forming streaks lengthwise down the nail. This form of melanonychia may be a sign of subungual melanoma, a type of skin cancer that develops underneath the nail.
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