Because mineral sunscreens aren't absorbed, older formulations often had a greasy feel and a white appearance. People who do not like the thicker texture of mineral sunscreens often use chemical sunscreens in creams or sprays. The ingredients form a thin protective film that absorbs UV rays and changes their structure, converting them into heat before they penetrate the skin. Extreme heat also means more sweating, and sweat can contribute to itchiness and rashes some people experience from ingredients in chemical sunscreens, Radusky added. Even in the absence of extreme heat, people with sensitive skin should opt for mineral sunscreens, the AAD advises.

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Persons: Johnson, Brian Snyder, Jacqueline, Ross Radusky, Radusky, Nancy Lapid, Michele Gershberg, Aurora Ellis Organizations: REUTERS, American Academy of Dermatology, Sun Protection, Research Center, Thomson Locations: Gloucester , Massachusetts, U.S, Scottsdale , Arizona, Dallas , Texas