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| Part of the sun's energy that reaches earth is composed of rays of invisible ultraviolet (UV) light. Signs & Symptoms Sunburn is a visible type of damage, which appears just a few hours after sun exposure. In many people, this type of damage also causes tanning. Freckles are nearly always a sign that sun damage has occurred, and therefore show the need for sun protection. Of the invisible damage to skin cells, some is repaired but some adds up year after year. After 20 to 30 years or more, the built-up damage appears as wrinkles and age spots. Although window glass blocks UVB light, UVA rays are able to pass through it. Treatment & Prevention Susceptible persons (light skinned, easily burned) playing or working outside in strong sunlight should be protected by clothing or sunscreen. Complications Sun exposure during youth is a risk factor for certain skin cancers, including melanoma. Severe burns, especially those that blister, increase the risk. |
| TMG (Tri-methyl-glycine) |