Doctor Answers (1) on Skin whitening
Use sunscreen frequently and liberally. Apply a broad-spectrum sunscreen with an SPF of at least 15. The American Academy of Dermatology recommends using a broad-spectrum, water-resistant sunscreen with an SPF of at least 30.
Reapply sunscreen every two hours — or more often if you're swimming or perspiring.
consult dermatologist if problem persists long