Acanthoma pilar sheath

A benign, small, papular or nodular skin neoplasm that usually arises above the upper lip. It is characterized by an epithelial proliferation with a central cavity. The cavity wall is lined with keratinocytes.

Disease Alternative Name

acanthoma of pilar sheath
pilar sheath acanthoma
acanthoma of the pilar sheath
infundibuloisthmicoma
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