Clinical Challenge: Itchy Bumps on a Man Who Uses a Hot Tub Regularly

A 33-year-old man presents with a 2-week history of itchy bumps on his arms and legs. His medical history is significant for ulcerative colitis, for which he is currently taking mesalamine. He lives alone and does not have pets. He has a hot tub, which he uses regularly. Examination reveals multiple erythematous papules on his extremities. At the patient's insistence, ...