The patient, a 45-year-old woman, was concerned about an eruption of scaly erythematous papules that had developed in both axillae three to four months earlier. Although the lesions were asymptomatic, the patient was concerned about their unsightly appearance. The woman regularly used deodorant and had not recently switched brands. In generally good health, she was not taking any medications and had no similar lesions.
An otherwise healthy 35-year-old African-American man had a two-week history of purple oval papules and plaques in his axillae and a single, large 3-cm plaque on his back. The lesions were slightly to moderately pruritic. He had not recently changed deodorants, soaps, or detergents. Neither tinea nor candidal infection was detected on KOH preparation. Rapid plasma reagin (RPR) and antistreptolysin-O (ASLO) tests were negative.