Both UVA and UVB rays can damage your skin, just in different ways. One causes premature aging, the other is more prone to causing sunburn, DNA damage, and skin cancer.

SPF, short for sun protection factor, represents how well a sunscreen protects against damage from the sun’s ultraviolet B (UVB) rays, which are responsible for sunburn and contribute to skin ...

Avoid peak sun hours. The sun’s rays are strongest between 10 a.m. and 4 p.m., so Dr. Lee recommends avoiding direct, unprotected sun exposure during these peak hours.

UV radiation comes primarily from the sun and is made up of UVA, UVB, and UVC rays. UVC rays do not reach Earth, but both UVA and UVB rays pose health risks. Learn more here.

The sun’s rays cause the majority of skin changes as you grow older. Here’s how sunscreen helps prevent the damage. By Dana G. Smith Have you ever looked at the skin on the buttocks of a 90 ...