sunburn


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sunburn,

inflammation of the skin caused by actinic rays from the sun or artificial sources. Moderate exposure to ultraviolet radiationultraviolet radiation,
invisible electromagnetic radiation between visible violet light and X rays; it ranges in wavelength from about 400 to 4 nanometers and in frequency from about 1015 to 1017 hertz.
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 is followed by a red blush, but severe exposure may result in blisters, pain, and constitutional symptoms. As ultraviolet rays penetrate the skin, they break down collagencollagen
, any of a group of proteins found in skin, ligaments, tendons, bone and cartilage, and other connective tissue. Cells called fibroblasts form the various fibers in connective tissue in the body.
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 and elastin, the two main structural components of the skin, a process that results in the wrinkled appearance of sun-damaged skin. In addition, the sun damages the DNA of the exposed skin cells. In response, the cells release enzymes that excise the damaged parts of the DNA and encourage the production of replacement DNA (a process that can go wrong and result in skin cancerskin cancer,
malignant tumor of the skin. The most common types of skin cancer are basal cell carcinoma, squamous cell carcinoma, and melanoma. Rarer forms include mycosis fungoides (a type of lymphoma) and Kaposi's sarcoma.
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). At the same time, the production of melaninmelanin
, water-insoluble polymer of various compounds derived from the amino acid tyrosine. It is one of two pigments found in human skin and hair and adds brown to skin color; the other pigment is carotene, which contributes yellow coloring.
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 increases, darkening the skin. Melanin, the pigment that gives skin its color, acts as a barrier to further damage by absorbing ultraviolet light. A suntan results from this attempt by the skin to protect itself. Light-skinned persons and infants are especially susceptible to ultraviolet rays because they lack sufficient protective skin pigment. Certain diseases and drugs may also increase photosensitivity.

Due to the increase in the incidence of skin cancer and the effects of ozone layerozone layer
or ozonosphere,
region of the stratosphere containing relatively high concentrations of ozone, located at altitudes of 12–30 mi (19–48 km) above the earth's surface.
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 depletion, more attention is being placed on protecting the skin from the sun's ultraviolet rays with broad spectrum sunscreens or clothing. Broad spectrum sunscreens block both UVA and UVB rays (two of the three bands of ultraviolet radiation). The relative UVB protection of a sunscreen is indicated by its SPF (sun protection factor) number. A higher number indicates a sunscreen that is more effective in preventing sunburn, but it is UVA radiation that is more likely to cause cancer and skin aging. A broad spectrum sunscreen with an SPF of 30 or higher is generally recommended by dermatologists. Some products may contain opaque formulations of zinc oxide or titanium dioxide that physically block all rays.

sunburn

[′sən‚bərn]
(medicine)
Skin inflammation due to overexposure to sunlight.

sunburn

1. inflammation of the skin caused by overexposure to the sun
2. another word for suntan
References in periodicals archive ?
Although the Sunburn City Festival is only travelling to Bengaluru, Mumbai, Hyderabad and Gurgaon, the brand itself has stormed the dance floors in places such as Raipur, Thiruvananthapuram, Kochi, Indore and Bhopal.
There are three types of sunburn that dogs can get - the first is called a superficial partial thickness burn and involves the top layer of skin.
Nationally, more people over a five-year time period report experiencing a least one sunburn in the previous year--a 2.
A survey of more than 1,000 men and women showed eight out of 10 were worried about the disease - and seven out of 10 admitted to having suffered sunburn in the last year.
Sunburn Alert(TM) products have received The National Parenting Center Seal of Approval and the company partners with The Shade Foundation and the Melanoma Research Alliance.
e longer you are exposed to the rays, the more severe sunburn you are going to get," says Dr Charlotte Jones, chair of the British Medical Association's GP Committee.
If you thought tinted car windows will help prevent sunburn, think again.
Skin cancer starts as an abnormality in the skin's inner or outer layers, resulting from sunburn, a mole or an irregular growth.
Some medicines can increase your risk of sunburn or interact with the sun to cause rashes or other side effects.
But Percept, the organisers behind Sunburn (the annual three-day electronic dance music festival in Goa), swear by that philosophy.
For Cooper, the water caused the UV rays to bounce up and sunburn Cooper's eyes.