NIHSeniorHealth: Skin Cancer

Skin Cancer Defined Causes and Risk Factors Symptoms, Screening, and Diagnosis Treatments and Research Frequently Asked Questions MedlinePlus for More Information Printer friendly version		Skin Cancer Frequently Asked Questions 12. What is SPF? SPF is a sun protection rating. The SPF of a sunscreen is a measure of the time it takes to produce a sunburn in a person wearing sunscreen compared to the time it takes to produce a sunburn in a person not wearing sunscreen. This varies from person to person, so be sure to reapply sunscreen every 2-3 hours.

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Last reviewed: 17 May 2007 First published: 17 May 2007 National Institute on Aging, U.S. National Library of Medicine National Institutes of Health, U.S. Department of Health & Human Services Contact us, Accessibility, Copyright, Privacy