If you've ever had a bad sunburn or blister you know, if you don't take the proper precautions, skin issues can sideline you just as badly as injuries to your muscles, bones, and joints.In addition to the temporary discomfort that goes along with a sunburn, lots of unprotected sun exposure can create serious health problems down the road. A study in the November 2006 issue of Archives of Dermatology found that marathoners had an increased risk of malignant melanomas and nonmelanoma skin cancer.And yet too often, runners just skin the sunscreen, says Brooke Jackson, a Chapel Hill, N.C.-based dermatologist and associate professor at University of North Carolina Dermatology, and 10-time marathoner. "The biggest mistake is not putting any on," says Jackson. "It takes less than a minute. Just do it!"
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