Expert analysis, the ultraviolet rays of the summer sun are relatively strong, the human body in the sun for too long, it is easy to appear acute sunburn. Acute sunburn does not manifest itself immediately after exposure to the sun, often 6 to 12 hours after exposure to bare skin will appear a large area of redness, peeling, serious blisters, edema, burning sensation, and some people will appear fever, blister ulceration symptoms. In the summer, people like to swim to spend the summer, but ignore the daytime in the river or pool for a few hours, the skin is more likely to sunburn. Because ultraviolet light reflected in the water, can cross more than a meter of water depth. And because the water will reflect the sun, the intensity of its exposure will be enhanced, people in the water will be double the UV radiation. Experts reminded that before playing to carefully apply waterproof sunscreen on the exposed parts of the skin, children should choose a special type of sunscreen for children. 12:00 noon to 2:00 pm the sun’s ultraviolet rays are the strongest, should avoid swimming outdoors at this time. After half an hour or an hour of water play, it is best to reapply sunscreen. Compared with adults, children’s skin is thinner, poor body resistance, more susceptible to sunburn, so the preparation work before water play should be more attention. When a mild sunburn, then the skin will be red, serious skin will have a burning sensation, pain, as if burned, which is an acute reaction to the skin damage stimulation. At this time, it is best to use ice, can eliminate the pain, and then use furnace glycolic lotion to wash the sunburned skin, to play a role in heat dissipation, astringent, anti-inflammatory, in addition to reducing the symptoms, but also to prevent further stimulation of the skin again ultraviolet light. Generally speaking, when the skin is sunburned, the body will speed up the metabolism and peel off the skin as soon as possible to restore normal skin. For the prevention of sunburn when swimming, experts recommend the following preventive methods: (1) to go swimming at the water’s edge, the exposed parts of all to use waterproof sunscreen, in a certain time and to a certain extent can protect the skin from ultraviolet damage. (2) After diving, surfing and swimming, you can apply sunscreen again as needed when you go ashore. (3) UV rays have advantages and disadvantages, proper sun exposure not only promotes the absorption of calcium in the body and enhances bone density, but also allows the skin to produce a certain amount of melanin and enhances the skin’s defense against UV rays, so experts say that the idea of completely isolating UV rays is rather absurd, and proper sun exposure to receive UV rays is good for your health. (4) When sunbathing, avoid the strong daylight at noon, you can choose before 10 a.m. and after 4 p.m., 30 minutes in the morning and 30 minutes in the evening.