Are any sunscreens really waterproof?

There's no such thing as a totally waterproof sunscreen—which is why you'll no longer see that term on labels. To learn more about getting the best sun protection when you're around water, watch this video featuring dermatologist Dr. Ellen Marmur.

Top dermatologists share their wisdom on ingredients and SPF levels—plus how much to use, how often to reapply, and more.

How does sunscreen protect your skin? Learn the facts about SPF, UVA, and UVB rays, broad-spectrum sunscreens, and more.

Necrotizing fasciitis is a dangerous infection that can start suddenly and move fast. Spot the signs and know how to respond.

These six possible causes of hair loss may surprise you.

Necrotizing fasciitis is a dangerous infection that can start suddenly and move fast. Spot the signs and know how to respond.