Evaluation of anogenital dermatitis requires a detailed history, including a sexual history. Men who have sex with men have different risk of certain infectious causes compared with men who have sex with women. Infectious causes of balanitis and anal dermatitis are easily treatable once identified. Irritant contact dermatitis is a common cause of balanitis, and avoidance of irritants, including decreased soap washing, helps many patients improve. Detailed histories of the personal products used by the patient and partner(s), including soaps, lotions, perfumes, lubricants, condoms, topical medications, hygiene sprays, personal wipes, and laundry detergent, may reveal possible irritants or contact allergens.