<unk> , also known as sunblock, sun cream or suntan lotion, is a photoprotective topical product for the skin that absorbs or reflects some of the sun's ultraviolet (UV) radiation and thus helps protect against sunburn and most importantly prevent skin cancer.<unk> s come as lotions, sprays, gels, foams (such as an expanded foam lotion or whipped lotion), sticks, powders and other topical products.<unk> s are common supplements to clothing, particularly sunglasses, sunhats and special sun protective clothing, and other forms of photoprotection (e.g. umbrellas, etc.). The first<unk>  in the world was invented in Australia, by chemist H.A. Milton Blake, in 1932 formulating with the UV filter 'salol (Phenyl salicylate)' at a concentration of '10%' Its protection was verified by the University of Adelaide and it was also produced commercially by Blake's company, Hamilton Laboratories. Despite<unk>  being relatively new, sun protection practices have been observed since at least the ancient Egyptians "who used ingredients such as rice bran, jasmine, and lupine" to provide sun protection.<unk> s are classified into inorganic (mistakenly called ‘physical’)<unk> s (i.e., zinc oxide and titanium dioxide) and organic (also, mistakenly referred to as ‘chemical’)<unk> s. Despite popular belief, both types of<unk> s work mainly by absorption of UV light. Newer studies have found that inorganic<unk> s may absorb up to 95% of UV light, while its deflecting ability might be up to only 5% (less than SPF 2). Medical organizations such as the American Cancer Society recommend the use of<unk>  because it aids in the prevention of squamous cell carcinomas. The routine use of<unk> s may also reduce the risk of melanoma. However, many<unk> s do not block Ultraviolet A (UVA) radiation, yet protection from UVA is important for the prevention of skin cancer. To provide a better indication of their ability to protect against skin cancer and other diseases associated with UVA radiation (such as phytophotodermatitis), the use of broad-spectrum (UVA/UVB)<unk> s has been recommended. In the United States,<unk> s are required to remain effective at original strength for at least three years. Some<unk> s include an expiration date—a date indicating when they may become less effective. Diligent use of<unk>  can also help to slow or temporarily prevent the development of wrinkles, dark spots and sagging skin.
Sunscreen
Barrier cream
Laser
Topical medication
Jewelry hygiene
Whitfield's ointment
Natural skin care
Ultraviolet light therapy