LEA PATERSON / SCIENCE PHOTO LIBRARY LEA PATERSON / SCIENCE PHOTO LIBRARY
Sun rash on a woman's arm and back. This is an allergic reaction to sunlight. Exposure to sunlight causes itchy red blisters. It is most common in individuals with pale skin. Those who are susceptible to sun rash should avoid the sun as much as possible, and wear a sunscreen of SPF15 or higher when exposure cannot be avoided.
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