Tanning melanin. The function of melanin is to protect us from ultraviolet rays, it is responsible for tanning. The melanocytes are on the skin, in the basal layer of the epidermis and are gradually activated with the sun. For starters, studies have confirmed that proper sun exposure helps prevent skin cancer. In fact, the onset of melanoma has been shown to decrease with sun exposure, and may increase with the use of sunscreens. Studies have revealed that patients with melanoma who had high levels of sun exposure were less likely to have malignant tumors.
Above all, the body needs its melanin production time, ideally it is to begin with small solar exposures. The skin when it is tanned no longer has the danger of burns. Self-tanning products do not influence the production of melanin. UVA rays penetrate deep into the skin, and these are the ones that brown us. Have a greater ability to stimulate melanocytes and produce melanin. However, when they get deeper they can cause burns and in some cases the appearance of skin cancers.
On the other hand both UVA and UVB can damage the DNA of the skin to produce cancer. Ultraviolet (UV) rays are divided into three types: UVA, UVB, and UVC. UVA rays, their wavelength is between 320 and 400 nm. Much of it is absorbed in by the ozone layer and clouds. However its radiation has more energy than the previous ones and is very harmful. They are also cause of burn and melanoma (skin cancer),