Proliferating trichilemmal cyst
From Infogalactic: the planetary knowledge core
Proliferating trichilemmal cysts (also known as a "Pilar tumor", "Proliferating follicular cystic neoplasm", "Proliferating pilar tumor", and "Proliferating trichilemmal tumor"[1]) are a cutaneous condition characterized by proliferations of squamous cells forming scroll-like structures.[1][2]:678
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