Perianal Crohn's disease.
The anus and perianal region are involved in up to 40% of patients with Crohn's disease. It is the sole site of involvement in approximately 5% of patients with this illness. The dark red fleshy tags are characteristic. Sometimes the pain and induration associated with these lesions responds to antibiotics and/or treatment of the underlying Crohn's disease. Surgical treatment is usually reserved for those with perianal abscesses or fistulae. Progression to anal squamous carcinoma is a rare late complication.
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