What Medication Can Cause These Skin Lesions to Develop?

A 27-year-old male presents with painful skin lesions in both armpits. He’s experienced several worsening episodes similar to this one since he was a teenager and is becoming increasingly distressed by them. His most recent episode resolved three months earlier. 

On examination, deep-seated inflamed nodules with purulent discharge and thick, rope-like scars are visible in the axillae. Nodules and pitted scarring are also present in the groin and perianal region. 

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