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A sunburn is a burn to living tissue such as skin produced by overexposure to ultraviolet (UV) radiation, commonly from the sun's rays. Exposure of the skin to lesser amounts of UV will often produce a suntan. Usual mild symptoms in humans and animals are red or reddish skin that is hot to the touch, general fatigue, and mild dizziness. An excess of UV-radiation can be life-threatening.
Sunburn is an acute cutaneous inflammatory reaction that follows excessive exposure of the skin to ultraviolet radiation (UVR). UVR exposure can come from a variety of sources, including sun, tanning bed, phototherapy lamp, and arc lamp.1 Long-term adverse health effects of repeated exposure to UVR are well described but are beyond the scope of this article. Sunburn is generally classified as a superficial or first-degree burn
Common Causes:
Sunburn results when the amount of exposure to the sun or other ultraviolet light source exceeds the ability of the body's protective pigment, melanin , to protect the skin. Sunburn in a very light-skinned person may occur in less than 15 minutes of midday sun exposure, while a dark-skinned person may tolerate the same exposure for hours.
Repeated sun exposure and suntans cause premature aging of the skin (wrinkling, sagging, and brown sunspots). Repeated sunburns increase the risk of skin cancer in the damaged area. Each blistering sunburn doubles the risk of developing malignant melanoma, which is the most serious type of skin cancer.
Dysplastic moles (nevi) are common, and many people have a few of these abnormal moles. The risk of melanoma is greatest for people who have a large number of dysplastic nevi. The risk is especially high for people with a family history of both dysplastic nevi and melanoma.
Sunburn Symptoms
Mild and uncomplicated cases of sunburn usually result in minor skin redness and irritation. Untreated and with enough exposure, you can experience shock (poor circulation to vital organs) and even death (sun poisoning). Sufficient exposure can become remarkably painful.
Pain usually peaks six hours to 48 hours after exposure to ultraviolet light. Within a few days, your body starts to heal itself by "peeling" the top layer of damaged skin. After peeling, your skin may temporarily have an irregular color and pattern. Depending on the severity, it may take several days or up to three weeks for the sunburn to heal.
Nitially, your skin turns red about 2-6 hours after exposure and feels irritated. The peak effects are noted at 12-24 hours.
More severe cases, such as those experienced by rafters (Cuban and other island peoples fleeing their countries on homemade rafts) are complicated by severe skin burning and blistering, massive fluid loss (dehydration), electrolyte imbalance, and infection.
Prevention
Apply generous amounts of sunscreen with a sun protection factor (SPF) of at least 30. Pay special attention to your face, nose, ears, and shoulders. The higher the SPF, the greater the protection.
Apply sunscreen 30 minutes prior to sun exposure to allow penetration. Re-apply after swimming and every 2 hours while you are outdoors.
Sunburn treatment
Take anti-inflammatory medication, such as aspirin or ibuprofen (Advil, Motrin, others), on a regular basis according to the label instructions until redness and soreness subsides.
Apply soothing lotions that contain aloe vera to sunburned areas. Topical steroids (such as 1% hydrocortisone cream) may also help with sunburn pain and swelling. Note: Do not use the cream on children younger than age 2 unless your doctor tells you to.
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