Sun Protection and Sunscreens (cont.)

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How should skin sunscreens be applied?

It's a good general rule to apply a sunscreen very liberally. Those who skimp won't receive full protection. The sunscreen should be applied about a half hour before going outside to allow time for the sunscreen to soak in and take effect.

Do water or perspiration wash off sunscreen?

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Yes. Therefore, sunscreen should be reapplied at least every two hours when staying outdoors for a prolonged period and after swimming, bathing, perspiring heavily, or drying off with a towel or handkerchief. Water- and perspiration-resistant sunscreens are available. However, even their protection will not last indefinitely and they should be reapplied frequently as well.

Can sunscreens cause a skin reaction?

PABA (para-aminobenzoic acid) was one of the original UVB-blocking products in sunscreens. Some people developed a skin reaction to this chemical, and it was also found to stain clothing. Over the years, PABA has been refined and modified into newer ingredients known as glycerol PABA, padimate A, and padimate O, all of which are UVB-blocking sunscreen ingredients. Other ingredients in sunscreens may also increase the risk of a skin reaction in certain people. Anyone can determine the suitability of a particular sunscreen without risk of serious harm by

  1. clothing his or her body fully except for a small patch of skin; and then
  2. applying the sunscreen to the skin patch and exposing it to sunlight.
  3. If a reaction occurs, the user should not use that product. He or she should try another product.

Should everyone use sunscreen protection?

As a general rule, babies 6 months of age or younger should not have sunscreen applied to their skin because their bodies may not be capable of tolerating the chemicals in sunscreens. Instead, they should be kept away from sun exposure.

Everyone over 6 months of age should use a sunscreen regularly unless they and their doctors decide it would be better to protect the skin in other ways.

Medically Reviewed by a Doctor on 5/23/2014

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