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Squamous cell carcinoma developing in Jadassohn's sebaceous nevus: case report and review of the literature.

Nevus sebaceous (or Jadassohn’s sebaceous nevus or organoid nevus) is a well-known congenital skin hamartoma involving ectodermand mesoderm-derived structures that usually appears in the head and face area. During childhood, the lesion remains static but, during puberty, grows and becomes more evident and verrucous. These changes reveal growth of pilosebaceous and apocrine elements, probably because of the influence of androgens.