Histopathologic features of trichilemmoma​

Trichilemmomas consist of lobular collections of keratinocytes with small nuclei and pink to pale cytoplasm. A rim of small, palisaded cells lines some areas of the tumor, and there are frequently areas of hypergranulosis resembling the koilocytic changes of human papillomavirus infection.
(A) H&E 40x.
(B) H&E 200x.