But another way to look at it is like painting a wall of your house. And this will cover the bits you may have missed, or covered too thinly, on first pass. Also, use it generously. Most people use too little between a quarter and three-quarters of the amount of sunscreen necessary to achieve the sun protection claimed on the label. A teaspoon per limb is a good rule of thumb. Add another teaspoon for your face, front and back. This comes to seven teaspoons 35ml in all if you are at the beach in board shorts or a bikini.
Layer it on and spread it around. Reapply every two hours or more often if you are active sweating, towelling off, skin making physical contact with anything that might rub it off , even if the bottle claims four-hour water resistance.
Use other things to protect your skin too. Hats, shade, clothing and even staying indoors at the highest UV periods. The closer to solar noon, usually between midday and Read more: Health Check: will I damage my eyes if I don't wear sunglasses? Looking for the best sunscreen for your skin type?
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When to talk to a dermatologist. UVB rays are the rays that tend to cause sunburn. Meanwhile, UVA rays penetrate down to the lower layer of your skin the epidermis , causing cells known as melanocytes to produce melanin. Melanin is the pigment that gives your skin its color.
Generally speaking, the more melanin, the darker the color. In essence, unless you block them from reaching your skin, those UVA rays responsible for your tan.
But when using sunscreen appropriately, you can drastically reduce your chances of developing skin cancer. For people with fair or light skin, less melanin is produced — meaning the skin is not protected from UVB rays, the rays that cause burns. With light-skinned people, any tanning that will occur usually happens quickly or within minutes - with the risk of burning much more likely.
Those with more melanin in their skin take typically longer to develop a tan and can usually spend hours in the sun without burning. While outside, it is important to know your skin type and wear the SPF factor sunscreen that will provide the correct amount of protection for you. According to skincancer. Light-skinned people have a higher risk of damage associated with tanning because of the lack of melanin to protect the skin from the sun.
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