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Sun protection factor rating is ideal, not actual, protection.(Skin Disorders)(Brief Article)

SAN DIEGO -- No matter what sun protection factor sunscreen you recommend, remember that the SPF system has its limitations, Shanna Meads, M.D., advised at a melanoma update sponsored by the Scripps Clinic.

For one thing, SPF measures only UVB protection, not protection from UVA rays, said Dr. Meads, a dermatologist and Mohs fellow at the Scripps Clinic-Torrey Pines, LaJolla, Calif.

Also, SPF is measured and classified under controlled laboratory conditions, "and most people don't live in a laboratory setting," she said.

And finally, consumers must follow directions for proper sunscreen use. "You have to apply at least 30 g to cover the entire body," she said. ...

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