Skin Myths: Fact or Fiction?

Fiction. A base tan provides only about SPF 3, and a tan is itself a sign of UV damage to the skin. It does not meaningfully prevent burning, and it still adds to your lifetime UV exposure and skin cancer risk.

Fact. Up to about 80 percent of the sun's UV rays pass through clouds, so you can burn on an overcast day. Daily broad-spectrum sunscreen is worth wearing even when it is not sunny.

Fiction. Standard glass blocks most UVB but lets through much of the UVA that drives skin aging and contributes to skin cancer. That is why drivers often show more sun damage on the window side of the face.

Fact. Skin cancer can affect every skin tone. In darker skin it is often found later and in less sun-exposed areas such as the palms, soles, and nails, which makes regular skin checks important for everyone.

Fiction. Tanning beds emit UV radiation and are classified as a Group 1 carcinogen, the same category as tobacco. Using them, especially before age 35, substantially raises the risk of melanoma.

Fiction. No sunscreen lasts all day. Reapply about every two hours, and after swimming, sweating, or toweling off, no matter how high the SPF number is.

Fiction. Most skin cancers are painless. Watch for the ABCDE warning signs, which are asymmetry, irregular borders, uneven color, a diameter larger than a pencil eraser, and any spot that is evolving, and have new or changing spots checked.

Fiction. UV rays reach your skin year-round, and snow and water reflect them. Dermatologists recommend daily broad-spectrum SPF 30 or higher in every season.

Fiction. Natural does not mean non-irritating. Many plant-derived ingredients, from poison ivy to essential oils and botanical extracts, are common causes of allergic contact dermatitis. What matters is how your skin reacts, not whether a label says natural.

Fiction. Sun protection factors do not add up. Applying two SPF 15 products does not equal SPF 30; you get roughly the protection of the higher single product. What actually improves real-world protection is using enough sunscreen and reapplying it, because most people apply far less than the amount used in testing.

Fiction. The numbers are not proportional. SPF 15 blocks about 93 percent of UVB, SPF 30 about 97 percent, and SPF 50 to 60 about 98 percent. Higher SPF adds only a little more protection with diminishing returns, so applying enough and reapplying matters more than chasing a big number.