Histologic features of proliferating cystic acanthoma (proliferating pilar tumor)

Proliferating cystic acanthoma (proliferating pilar tumor) consists of multiple small to large interconnecting collections of keratinocytes with abundant pink cytoplasm that cornify centrally without a granular layer. Central calcification is often present. Cytologic atypia is minimal in this case.
(A) H&E 20x.
(B) H&E 100x.