Trichoblastomas are a skin condition characterized by benign neoplasms of the follicular germinative cells known as trichoblasts.

[1]: 673 Trichoblastic fibroma is a term used to describe small nodular trichoblastomas that contain a conspicuous fibrocytic component, sometimes constituting over 50% of the lesion.

It shows a pseudo-encapsulated, multinodular, basaloid tumor with fibrocellular stroma spanning the reticular dermis extending into subcutaneous fat (A).

Tumor lobules were arranged as monomorphous basaloid cells in a cribriform pattern with peripheral palisading some resembling abortive hair follicles (B, F).

Focally, tumor lobules exhibited squamous eddies, papillary mesenchymal bodies, and a germinative component comprising basaloid cells admixed with distinct pales cells (Zellballen) (C–E, D is an enlargement of boxed area in C).