What are the differences between UVA and UVB rays?

Here's an easy way to remember it: UVA = aging rays and UVB = burning rays. While most people associate applying sunscreen with preventing getting sunburned, it's important to remember that UVA rays are present throughout the year at the same intensity (even when it's cloudy) and the damage they cause is not immediately visible. UVA ray damage will slowly but surely start to accelerate most of the signs of aging like pigmentation, loss of elasticity, rough skin, dryness, etc.

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