Tanning of the skin
I see people often get a tan on the beach in summer. In fact, it is not good for health. Please be careful that you do not exceed the limit. Then, I wish to introduce several points. There are two types of sun tan. When skin is exposed to ultraviolet rays, the skin suffers from inflamation turning red and causing melanin to rush to the skins surface. This inflammation is called "Sunburn" An increase of melanin on the skin's surface is called "Suntan " Tan occurs when skin is exposed ultraviolet rays beyond the protection of melanin. The quantity of melanin has individual difference. Dark-skinned people has much melanin from the fair-skinned person. This data means dark-skinned people cannot get tanned easily. There are two types in the tan. When skin is exposed to ultraviolet, skin inflame red and melanin fix on the skin surface. The inflammation is called "Sunburn" Fixing on the skin surface is called "Suntan " |
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Sunburn refers to things which UVB irritates capillaries and the skin becomes red when UVB penetrates an outer skin and reaches a dermal-papillae. When the amount of ultraviolet rays exceeds the defense capability of a melanin, a cell gets injured and heat generation, bulla, and a pain occur.
＜Suntan＞
UVA stimulates generating of a melanin and the skin discolors darkly. The skin does not cause inflammation by UVA. But UVA reaches deep in the Corium and cause wrinkles and sagging
＜the risk of cancer＞
Both UVA and UVB cause skin cancer because ultraviolet damage to their DNA. Usually, most of the damage is repaired. Prone to skin cancer when a restoration function is lost. But there is no need to worry too much. There is no problem in particular in an ordinary life.
＜major symptom of tan＞
As a major symptom of tan, concern, dropsy, exfoliation of the skin, rash. Other symptoms include nausea, and fever. In extreme suntan, the body may become weak and may need hospitalization.
Recent years, medically it is said that exposure to ultraviolet light is better. People occur skin cancer and cataracts with skin aging by tanning. Because a weakened immune system of the skin by ultraviolet, it is used only to treat.
＜Against sunburn＞
UV rays promote the pigmentation in the skin such as spots and freckles. The good method of the suntan is that to exposure to ultraviolet rays without causing inflammation. It is desirable to wear a sunscreen and cut the UVB that causes inflammation Burning on a beach for a long time should avoid from the first day.
※１ Melanin・・・Black pigment present in animal tissues and cells.