Danger of sun rays
In fact, sun exposure causes many of the skin changes that we think of as a normal part of aging. Over time, the sun's ultraviolet (UV) light damages the fibers in the skin called elastin. When these fibers break down, the skin begins to sag, stretch, and lose its ability to go back into place. The skin also bruises and tears more easily -- taking longer to heal. So while sun damage to the skin may not be apparent when you're young, it will definitely show later in life.
How Does the Sun Change Skin?
Exposure to the sun causes:
Pre-cancerous (actinic keratosis) and cancerous (basal cell carcinoma, squamous cell carcinoma, and melanoma) skin lesions
Fine and coarse wrinkles
Discolored areas of the skin, called mottled pigmentation
A yellow discoloration of the skin
The dilation of small blood vessels under the skin