Some Lip Gloss May Promote Cancer

Bonus: If you really need another reason to make sure your gloss is SPF 15, think about the prematurely wrinkle-mouthed look you probably want to avoid. Fewkes says that if gloss does, in fact, increase lips vulnerability to UV rays, it stands to reason that it promotes photoaging as well.

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Larger Skin Lesions More Likely to Be Melanoma

"The damage done short of a true cancer can be very difficult to treat," she says, referring not only to painful fissures, but to solar keratosis -- nonmalignant yet unpleasant crusty bumps.