According to ClevelandClinic.org, moles are growths on the skin that usually have a brown or black appearance. Moles are often present at birth, but they can develop later in life, and sun exposure is a common cause. While most moles are not cancerous, all new moles and existing moles should be checked from time to time by a doctor. However, there are some things you can do to prevent the formation of moles on your face and body.
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Avoid the sun at the brightest time of the day. According to MayoClinic.com, you should avoid the sun from 10 a.m. to 4 p.m. because ultraviolet rays are at their most intense during that period.
Use adequate sunscreen every time you go out in the sun. MayoClinic.com recommends using sunscreen with a sun protection factor, commonly abbreviated as SPF, of at least 15. Apply 20 to 30 minutes before going out in the sun.
Reapply your sunscreen every two hours. This is especially important if you are swimming or playing sports where sunscreen can easily come off. Avoid water or excessive perspiration for 30 minutes after reapplying your sunscreen.
Wear a hat or protective headgear when in the sun. Protective headgear should not replace sunscreen, but serve to further protect from harmful UV rays.
Buy protective clothing that can block UV rays if you have a history of moles and skin cancer runs in your family. This special clothing can be purchased through a variety of online retailers and specialty stores, and many sporting goods stores have started to carry clothes made of UV-blocking materials as well.