Both UVA and UVB rays from the sun can damage your skin, resulting in older-looking and less resilient skin.
This damage can cause wrinkles, thickening, dark spots, enlarged or broken blood vessels and more.
Topical sunscreens play an important role in protecting your skin from the sun.
However, many environmental factors can reduce the effectiveness of your sunscreen, including weather, location and what you are doing in the sun (swimming, sweating, etc.).