By Suzanne Dixon, MPH, RD. Updated June 27, 2016. Learn how to prepare for colon cancer screening during the day before your scheduled examination. The day before a colonoscopy, you will begin having only clear liquids, starting with either lunch or dinner.
In addition, UV light stimulates melanin cells in skin, causing them to darken; when this happens, you have a tan. Unfortunately, there is no such thing as a safe tan. The UV light that burns or tans you damages skin cells in ways that can accelerate skin aging, and even increase your risk of developing skin cancer. There are two kinds of UV light: Ultraviolet A (UVA) and ultraviolet B (UVB).
A tan is visible proof that your skin has been damaged by UV rays. Tanning is your skin's response to overexposure to UV rays. Sunburn is also caused by too many UV rays: your skin turns red and may become hot and painful or even swell and blister. Overexposure to UV rays also causes premature aging effects, like: 1  skin wrinkling and hardening (leathery skin) 2  blotchiness. 3  loss of elasticity. 4  dark patches (age spots or liver spots) 5  precancerous skin changes (called actinic keratoses) Skin damage caused by the sun is cumulative. This means that long-term, daily exposure to sunlight adds up. UV exposure causes damage in the DNA of your skin cells. Damaged cells die or repair themselves. If, however, the damage is too severe to be repaired, you can get skin cancer.