Trichilemmal Horn

Abstract

A trichilemmal horn is a rare benign follicular lesion with trichilemmal differentiation. This is a case report of a 73-year-old female who presented with a large growing cutaneous horn over her left zygoma. The histopathology of the excised lesion revealed a trichilemmal horn. Various theories have been formulated to explain this condition. A diagnosis of a trichilemmal horn should be considered when a cutaneous horn shows trichilemmal keratinisation in the absence of dermal inflammation.