Benefits<unk>  use can help prevent melanoma and squamous cell carcinoma, two types of skin cancer. There is little evidence that it is effective in preventing basal cell carcinoma. A 2013 study concluded that the diligent, everyday application of<unk>  could slow or temporarily prevent the development of wrinkles and sagging skin. The study involved 900 white people in Australia and required some of them to apply a broad-spectrum<unk>  every day for four and a half years. It found that people who did so had noticeably more resilient and smoother skin than those assigned to continue their usual practices. A study on 32 subjects showed that daily use of<unk>  (SPF 30) reversed photoaging of the skin within 12 weeks and the amelioration continued until the end of the investigation period of one year. A tube of SPF 30 sunblock on sale in the United States. Minimizing UV damage is especially important for children and fair-skinned individuals and those who have sun sensitivity for medical reasons. Potential risks In 2009, the Therapeutic Goods Administration of Australia updated a review of<unk>  safety studies and concluded: "The potential for titanium dioxide (TiO2) and zinc oxide (ZnO) nanoparticles in<unk> s to cause adverse effects depend primarily upon the ability of the nanoparticles to reach viable skin cells. To date, the current weight of evidence suggests that TiO2 and ZnO nanoparticles do not reach viable skin cells."<unk>  ingredients typically undergo extensive review by government regulators in multiple countries, and ingredients that present significant safety concerns (such as PABA) tend to be withdrawn from the consumer market. There is a risk of an allergic reaction to<unk>  for some individuals, as "Typical allergic contact dermatitis may occur in individuals allergic to any of the ingredients that are found in<unk>  products or cosmetic preparations that have a<unk>  component. The rash can occur anywhere on the body where the substance has been applied and sometimes may spread to unexpected sites." Vitamin D production There are some concerns about potential vitamin D deficiency arising from prolonged use of<unk> . The typical use of<unk>  does not usually result in vitamin D deficiency; however, extensive usage may.<unk>  prevents ultraviolet light from reaching the skin, and even moderate protection can substantially reduce vitamin D synthesis. However, adequate amounts of vitamin D can obtained via diet or supplements. Vitamin D overdose is impossible from UV exposure due to an equilibrium the skin reaches in which vitamin D degrades as quickly as it is created. Studies showed that<unk>  with a high UVA protection factor enabled significantly higher vitamin D synthesis than a low UVA protection factor<unk> , likely because it allows more UVB transmission.
Sunscreen
Barrier cream
Laser
Topical medication
Jewelry hygiene
Whitfield's ointment
Natural skin care
Ultraviolet light therapy