A 60-year-old man consulted for a changing of color of one of his nevi on his back. The upper part of this nevus turned dark brown a few months before.
On the upper part of the lesion, dermoscopy revealed an atypical reticular pattern, asymmetric irregular globules and a blotch.
On the lower part of the lesion, there was an homogeneous non pigmented pattern with some comma vessels in favor of a dermal nevus.
The tumor was excised and pathology revealed a superficial spreading melanoma developed on a pre-existing dermal nevus.
Other cases of melanoma
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