Sunscreen Updates

Sunscreen Updates Posted By:
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Everyone knows they should protect their skin from the harmful effects of UVA and UVB exposure. The proper way to do so, however, has been the subject of much debate. The arguments are endless: "I can't wear sunblock because I need to get my vitamin D to ward off autoimmune conditions," "Sunscreens are killing the Great Barrier Reef in Australia," and, my all-time favorite, "I need to get a base tan so that I don't get a sunburn." Regardless of the reason, we all need some practical, evidence-based data to reassure ourselves and our patients on the proper way to protect our skin. Here are some practical reminders when it comes to proper sun protection.

  • The American Academy of Dermatology recommends using broad-spectrum sunscreen products that have an SPF of 30 or higher and are "water resistant" or "very water resistant."
  • All skin types are vulnerable to the harmful effects of the sun; therefore everyone should practice sun protection. Those with lighter skin, of course, are at higher risk of developing skin cancers and sunburns.
  • Sunscreen should be applied 15 to 30 minutes before sun exposure and reapplied every 2 hours or after water exposure. One "shot glass" full of sunblock is an appropriate reference for adequate coverage of face, neck, ears, trunk, and extremities.
  • There is no such thing as a "healthy tan" and the benefit of obtaining a "base tan" is fake news. All tanning is the result of radiation exposure. The best prevention from burning is appropriate sun protection.
  • There is some truth to the risk of coral reef damage due to sunscreen run-off, although studies are limited. Consider wearing skin barrier protection such as protective clothing or scuba suits to protect the skin rather than chemical sunscreens. If you must use sunscreens, use those that are deemed less environmentally toxic.
  • Sunscreens tend to have a well-established safety profile, despite data demonstrating percutaneous absorption. If you're worried about systemic absorption, go with sunscreens that contain zinc oxide or titanium dioxide.
  • Sun barrier protection using hats and clothing is safe and effective, depending on the ultraviolet protection factor of the fabric. Wearing hats or bandanas that protect the ears and neck is especially useful, and sun shirts with long sleeves are now made with material that is cool and comfortable.
References
  • Baron ED. Selection of sunscreen and sun-protective measures. www.uptodate.com/contents/selection-of-sunscreen-and-sun-protective-measures. Accessed August 12, 2020.
  • Cooper K, et al. Sunlight, tanning booths, and vitamin D. JAAD. 2005;52:868-876.
  • Gies P. Photoprotection by clothing. Photoderm, Photoimm & Photomed. 2007;23:264-274.
  • Schneider SL, Lim HW. Review of environmental effects of oxybenzone and other sunscreen active ingredients. JAAD. 2019;80:266-271.

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Filed under: Dermatology , Miscellaneous

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