We all know to use a sunblock that blocks both UVA and UVB rays. But what kind of damage do these rays do? UVA rays are a major factor in skin aging (A=age). UVA radiation is constant and present all year. UVB rays lead to burns (B=burn). The amount of UVB varies with the season and is most intense in the summer. Skin color changes are an indicator of exposure to UVB: freckles, tans and burns. The effects of UVA damage is cumulative and shows up later as wrinkles, skin laxity, and texture changes.
If your skin has many moles, sun exposure may be a factor in the development of these. Generally, the more moles you have, the more likely one can become cancerous.
Midday sun is more damaging. Dark skin is not necessarily protective from damage. A tan or a burn are both indicative of damage from UVB. The UV index is a measure of how damaging the sun can be. Higher elevation and summer season are usually higher risk.
DON'T FORGET TO PROTECT WITH SUNSCREEN - DAILY!