trichilemmoma

Definition: Trichilemmoma is a cutaneous condition, a benign neoplasm that differentiates toward cells of the outer root sheath. The lesion is often seen in the face and neck region.

Multifocal occurrence is associated with Cowden syndrome, patients with which exhibit hamartomatous intestinal polyposis as well as tricholemmoma.

Differential diagnosis

 clear cell acanthoma
 trichilemmal carcinoma
 trichilemmal horn

Predisposition

 Cowden disease

See also

 cutaneous follicular tumors