A squamous cell carcinoma that originates in the skin of the anal margin.
Comment:
Clinical presentations include pain, bleeding, palpable lump, and discharge. Typically, SCC of the anal margin appears as an ulcerated lesion with rolled everted edges. A significant number of patients are misdiagnosed with an anal fissure, fistula, eczema, or hemorrhoids; therefore a biopsy is recommended for any persistent anal margin lesion not responding to conservative therapy.