Solitary Keratoacanthoma of the Scalp: A Case Report.

Keratoacanthoma (KA) is a pruritic, rapidly growing cutaneous neoplasm originating from the infundibulum of the hair follicle on the sun-exposed area. Usually presents as a dome-shape with a centralized keratinous plug. Whether KA is benign or malignant is challenging due to its similarity to squamous cell carcinoma (SCC). In this case study, we present a 57-year-old patient who came to the surgery clinic with a rapidly growing ellipse-shaped nodule on her scalp for two years, which was diagnosed and treated as solitary KA by excisional biopsy. This case represents the first reported KA on the scalp of an elderly patient in Saudi Arabia.