"UVB rays cause sunburns by damaging the skin’s outer layers, and overexposure can lead to rashes and irritation in people with sun allergies. UVA rays, which penetrate deeper, can also cause ...

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.

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.

Sun allergies are triggered, not only by sunlight but also by the body's reaction to UV radiation or its interaction with substances on the skin. "UV radiation is the main trigger," explains Mallory.