What is causing white patches to appear on my skin? (Photo)

Idiopathic guttate hypomelanosis (IGH) appears as small white spots on the skin. It affects areas that receive high amounts of sun exposure, such as the arms and legs. Don't be alarmed, though, as these spots aren't a sign of a worsening condition. It could take up to several months to completely resolve it, depending on how much sun exposure you have. Treatment includes cryotherapy, superficial dermabrasion, topical retinoids, intralesional corticosteroids, or topical tacrolimus.