The skin’s sensitivity to the sun is affected by skin color, time of sun exposure and UV radiation. Greater exposure to sunlight for a long time, the risk of malignant and pre-malignant skin tumors such as malignant melanoma, basal cell carcinoma, squamous cell carcinoma, and actinic keratosis. It also means that premature skin aging – the skin becomes thick, loose and wrinkled.
The longer time in the sun, the greater the risk of sunburn. The first sign of acute sunburn are redness and tingling of the skin. What then happened is that the skin is exposed to more UV radiation than it has had time / been able to build up protection. What happens in the cells is the genetic material (DNA) damage. The skin has repair mechanisms, but if solskadorna are many and takes place over several years, it is not enough repairs to and the cells can begin to grow more out of control.
UV radiation (ultraviolet radiation) is electromagnetic radiation emitted from the sun. Store portion of UV radiation wavelengths are shorter than the wavelengths of visible light. UV radiation is divided into groups, UVA, UVB, and UVC. The three different types of UV radiation affect the skin in slightly different ways. UVA radiation accounts for most of the sun’s rays and the radiation that penetrates most deeply into the skin, making the pigment brown and wrinkled skin. UVB rays are the rays that cause we burn ourselves, and damages the DNA. These beams remain in the epidermis. They stimulate pigment cells to form new pigments. They are strongest at noon and do not penetrate through forsterglas. UVC radiation is very strong but completely filtered out by the ozone layer. The ozone layer also filters out most of the UVB rays.
SPF – Sun Protection Factor – indicates how much longer you may be in the sun before you turn red in relation to if you do not use any sunscreen at all. This means that if you turn red after staying in the sun for 10 minutes, does SPF 6 that you can handle yourself in the sun for an hour but instead will turn red. This is however subject to a thick layer of greased up and that you can not bathe without re-application again.
The skin of the face is more sensitive than skin on rest of body. Therefore, one should always have higher SPF on your face. Use SPF 25 or 30 in the face. Always use a sunscreen that protects against both UVA and UVB.
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