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What are the types of UV rays and how do they affect skin?

There are 3 types of UV rays: UV-A, UV-B, and UV-C.
UV-A and UV-B are rays that reach the earth’s surface, while UV-C rays are absorbed by the ozone layer.

UV-A rays can penetrate into skin and accelerate aging.
Although it does not cause acute inflammation, long-term exposure to UV-A rays can cause skin to wrinkle and lose its elasticity.

UV-B rays are the cause of skin redness, inflammation and stinging sensations. When skin is exposed to the sun, the melanin levels in skin are increased. This causes red or black spots to develop. It also decreases the moisturizing ability of skin, resulting in dry and rough skin as well as wrinkles.

UV-A causes skin to turn dark immediately after being exposed to the sun. On the other hand, UV-B causes skin to first turn red and then dark after a few days. Generally, skin turns red 8 to 24 hours after being exposed to the sun. Skin then turns darker after that. However, skin tone changes vary with individuals.