Mummified ossified melanocytic naevus.

Ossification rarely occurs within melanocytic naevi. As far as we know, mummification (presence of shadow cells) has never been described within these lesions. We report herein the case of a benign naevus associating ossification and mummification; this case suggests that, similarly to pilomatricomas, osteoma formation within melanocytic naevi may develop as a result of mummification.