Routine Care & Treatments A key determinant of skin cancer in adulthood is the exposure to excessive amounts of sunlight as a child. Children between the ages of 5 and 9 are more receptive to intervention and change than older children. Children should be taught correct use of sunscreen. Sunscreen should be applied to all exposed skin at least 20 minutes before going into the sun, even if it’s cloudy outside, and needs to be reapplied every 2 to 3 hours or more frequently if swimming or exercising. Use at least 1 ounce per application, roughly equivalent to the volume of a shot glass. Everyone needs to wear a hat and sunglasses with 99 percent to 100 percent UVA absorption. Patients should be instructed to avoid exposure between the hours on 10 a.m. and 4 p.m. when the sun is the strongest, wear sun protective clothing and seek shade whenever possible. Children and teenagers need to know there is no such thing as a safe tan. Teenagers and women are considerably more likely to visit tanning salons, some logging over 20 hours of exposure per year. Tanning operations are poorly regulated and existing regulations and recommendations are frequently ignored. Ninety-five percent of tanning salon customers exceeds the recommended limits for ultraviolet exposure and one third of tanners begin tanning at the maximum dose recommended for maintenance.