Vitiligo

A healthy 25-year-old brunette woman reports a 12-month history of skin depigmentation. She first noticed patches of skin whitening on her hips, followed by additional depigmented patches on her elbows, shins, upper eyelids, and lower chin. A dermatologist recently made a diagnosis of vitiligo and recommended a sunscreen but offered little hope for treatment. How should she be evaluated and treated?