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Sunscreen
Sunscreen (also commonly known as sun screen, sunblock, suntan lotion, sunburn cream, sun cream or block out)〔(【引用サイトリンク】 title=Preventing melanoma )〕 is a lotion, spray, gel or other topical product that absorbs or reflects some of the sun's ultraviolet (UV) radiation and thus helps protect against sunburn. Skin-lightening products have sunscreen to protect lightened skin because light skin is more susceptible to sun damage than darker skin. A number of sunscreens have tanning powder to help the skin to darken or tan; however, tanning powder does not provide protection from UV rays.
Depending on the mode of action, sunscreens can be classified into physical sunscreens (i.e., those that reflect the sunlight) or chemical sunscreens (i.e., those that absorb the UV light).〔(Sunscreens | The Ageing Skin )〕
Medical organizations such as the American Cancer Society recommend the use of sunscreen because it aids in the prevention of squamous cell carcinomas.〔(What You Need To Know About Skin Cancer )〕 Many sunscreens do not block UVA radiation, which does not primarily cause sunburn but can increase the rate of melanoma and photodermatitis. The use of broad-spectrum (UVA/UVB) sunscreens can address this concern. Diligent use of sunscreen can also slow or temporarily prevent the development of wrinkles and sagging skin.
== Health effects ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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