A 63-year-old otherwise healthy woman comes to see you for chafing and ulceration related to a perianal skin tag. It has been present ever since she was pregnant years ago; however, in the past 6 months, there is an area that has been bleeding persistently. On examination, she has a large 3-cm perianal skin tag, with a small area of ulceration at the base measuring about 1–2 mm. You take her for excision of this tag, and the pathology comes back as invasive, well-differentiated squamous cell carcinoma, 6 mm in width, with margins negative at least 1 cm from the edge of the specimen. Staging workup and imaging are negative. The recommended next step in treatment is
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