[1]: 675  Pilar sheath acanthoma is a skin-colored, 5-10 mm diameter papule or nodule with a keratin-filled pore in the center.

Pilar sheath acanthoma manifests as a single, skin-colored papule or nodule that is 5–10 mm in diameter and has a keratin-filled pore in the center.

[3] Histopathologically, pilar sheath acanthoma is characterized by a centrally located, cystically dilated follicle that opens to the surface and contains keratinous material.

The outer rooth sheath epithelium that makes up tumor lobules extends into the nearby dermis and may even reach the subcutis.

Possible observations include infundibular keratinization of the epithelium and individual tumor cells with high glycogen content.