HISTORY
This 16-year-old boy had slowly progressive hypopigmented lesions on the lower extremities for the past 4 years. He also had atopic dermatitis, asthma, and allergic rhinitis. His 38-year-old mother had Hashimoto thyroiditis. None of his immediate family members had a similar skin disorder.
PHYSICAL EXAMINATION
Well-demarcated, depigmented patches on extensor aspects of lower legs. Remaining findings unremarkable.
WHAT’S YOUR DIAGNOSIS?
Answer and discussion on next page.
