No one likes to hear it, but when it comes to sun safety, there’s a good chance you’re doing it wrong.

Nearly 5 million Americans are treated for skin cancer each year, making it the most common form of cancer by far, according to the American Cancer Society (ACS). Your skin is the largest organ of the body and the most subjected to the harsh ultraviolet (UV) rays of the sun, which are known to cause cancer, yet most of the damage is preventable with proper sunscreen use.

Cultivating facts from the ACS, U.S. Food and Drug Administration (FDA), the Centers for Disease Control and Prevention (CDC), and the Skin Cancer Foundation (SCF), we’ve come up with a list of things we think you should be aware of when using sunscreen.

1. Not all sunscreens protect you from the sun.

Many sunscreens only protect you from the sun’s UVB rays, and not UVA rays. UVB rays penetrate the top layer of skin and cause burns, while UVA rays contribute to wrinkles, premature aging, and can damage your DNA. The ACS says that both types of UV radiation can cause skin cancer, and also warns that tanning beds are known to give off large amount of UVA rays.

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