Some physicians consider the skin's tanning a response to injury because it appears after the sun's UV rays have killed some cells and damaged others. I and II are at the highest risk. Sunscreens come in a variety of forms such as lotions, gels, and sprays, so there are plenty of different options. There are also sunscreens made for specific purposes, such as the scalp, sensitive skin, and for use on babies. Regardless of the type of sunscreen you choose, be sure that you use one that blocks both UVA and UVB rays and that it offers at least SPF 15.
Higher numbers indicate more protection.
As a rule of thumb, you should always use a sunscreen with at least SPF 15. Though recently developed sunscreens are more resistant to loss through sweating and getting wet than previous sunscreens were, you should still reapply frequently, especially during peak sun hours or after swimming or sweating. Such products contain chemicals that interact with the skin to protect it from UV rays. Sunscreens help prevent problems related to sun exposure, such as aging skin and precancerous growths. Keep in mind that sunscreen is not meant to allow you to spend more time in the sun than you would otherwise.