Cutaneous Horn Arising from an Inverted Follicular Keratosis: A Rare Case Report

Abstract

In the present case report, a 61-year-old male presented with a slowly progressing conical keratotic growth measuring 2.5 cm over the right ear. The lesion, which was non-tender on palpation, resembled a cutaneous horn or cornu cutaneum-an outgrowth made of compact keratin that rises above the skin’s surface. Since the clinical appearance of this uncommon benign tumour, known as Inverted Follicular Keratosis (IFK), is difficult to distinguish from other conditions, histopathology is the only method that can establish the diagnosis. No abnormalities were detected during general and systemic examination. The lesion was excised, and histopathological examination confirmed it as a case of IFK.

Keywords

• cornu cutaneum
• endophytic growth
• follicular infundibulum
• tumour