Cutaneous Horn Arising From a Keratoacanthoma: A Report of a Rare Case From a Primary Health Care in the Recôncavo Region of Bahia, Brazil

A cutaneous horn is a rare epithelial lesion, typically asymptomatic, attached to the stratum corneum in a cone-like shape, composed of keratin, and most commonly occurring in elderly individuals.This condition may arise from benign, premalignant, or malignant epidermal lesions and requires excisional biopsy for definitive diagnosis.The standard treatment remains surgical excision, with wide removal of the base.In this case report, we present a 66-year-old female patient who attended a Primary Health Care center in the Recôncavo Region of Bahia and exhibited a cutaneous horn on her right elbow.After surgical removal of the sample, histopathological analysis revealed a lesion originating from a keratoacanthoma, a condition that, although generally benign, exhibits rapid growth and may be associated with squamous cell carcinoma.Therefore, surgical excision is always recommended.