In summer, ultraviolet rays are very strong. If you are exposed to the sun for 15 minutes, you will feel your skin burning. Short-term sunburn can lead to redness of the skin. If you stay in the sun for a long time without any protection, sunburned skin will have severe pain and peeling.

When skin is irradiated by ultraviolet rays, tyrosinase activity in melanocytes will be enhanced, and melanin synthesis will be accelerated, leading to pigment deposition and skin blackening. If you don't pay attention to the repair after sun exposure, spots will grow out slowly and accelerate skin aging. To make matters worse, the more sunburn, the more serious the injury.

Extended data:

Moderate sunshine "sunbathing therapy" is helpful to health;

Although it is not suitable for exposure in summer, sunbathing under appropriate circumstances does have a certain health-keeping effect. By sunbathing, the human body is not only affected by infrared rays, visible rays and ultraviolet rays contained in sunlight, but also by meteorological factors such as temperature and humidity in the air.

Therefore, sunbathing has many effects on health. Studies have shown that moderate sunlight can dilate skin blood vessels, promote metabolism, improve skin function and make skin healthy.

Ultraviolet ray is the strongest spectrum in sunlight, which can inhibit and kill microorganisms on the skin surface, in addition, it can increase the synthesis and absorption of vitamin D and contribute to the growth and development of bones. Infrared rays can penetrate the epidermis and reach deep tissues, thus increasing the temperature of irradiated tissues, accelerating blood flow, improving blood circulation and strengthening skin metabolism. Visible light has an emotional effect on people through skin and vision, which makes people feel comfortable. Therefore, it is reasonable to keep in good health through sunshine.

People's Daily Online-Sunbathing can keep you healthy, but too much sun exposure will hurt you.