In summer, girls who love beauty and are afraid of hurting their skin have prepared umbrellas, sunglasses and sunscreen early. No matter in the morning or evening, rainy or cloudy, in order not to get sunburned, arm yourself to the end. However, the reporter recently learned from the dermatology department of Beijing Hospital that sunbathing on cloudy days with low ultraviolet radiation intensity in the morning and evening is of positive significance to people's skin health. The most suitable time is early morning and evening. Experts suggest that strengthening the skin's tolerance to sunlight is an important measure to protect skin health. Choosing to bask in the sun in the early morning and evening when the sun is not too strong can not only enhance the adaptability of the skin, but also prevent the skin from being excessively sunburned and tanned in summer. Some people don't even go out when they hear that there is ultraviolet light outside on rainy days. Hiding in a room can make your skin healthy? According to Dr. Feng Heping from the dermatology department of Beijing Hospital, solar dermatitis caused by poor light tolerance of skin is very common in summer. Nowadays, many people spend much longer working in office buildings than in outdoor activities, and their skin's ability to resist sunlight is correspondingly weakened, which is why some fair-skinned people are particularly prone to sunburn. Therefore, strengthening skin's tolerance to sunlight is an important issue in shaping healthy skin. In order to enhance the adaptability of the skin and prevent the skin from being sunburned and tanned in summer, we should choose an appropriate time to bask in the sun. The most suitable time is in the early morning and evening when the sun is not too strong. Exposure to the sun for too long will dry the skin. However, prolonged exposure to unprotected sunlight can also lead to chronic skin damage. Such as seamen, geological prospectors, farmers, athletes and other parts exposed to the sun for a long time, such as face, neck, chest triangle and bare limbs, often appear obvious dryness, roughness, desquamation, pigmentation, atrophy, increased wrinkles, loss of elasticity and so on. Some people have thick skin at the back of the neck, deep dermatoglyphics and diamond-shaped skin at the neck. After a long period of intense sun exposure, diffuse erythema will appear on the exposed skin. It is bright red at first, and then gradually turns dark red, which may cause burning or tingling. Lighter people will peel off their skin within 2 to 3 days, leaving brown pigment to heal itself. In severe cases, skin swelling or blisters may occur. Therefore, attention should be paid to avoid exposure to the sun in strong sunny weather and from 10 to 4 pm. The effect of external application of fruits and vegetables is not as good as nutrition. Today, the nutrition and external application of fruits and vegetables are very popular. Girls who love beauty must think that these have a great effect on sun protection and black suppression. In fact, their effect is not as obvious as expected. According to Dr. Feng, the skin's function of absorbing nutrients from the outside world is not very strong, but from a health point of view, eating less irritating food, eating more light food, maintaining good work and rest habits, ensuring sleep and cleaning the skin more are more important for skin maintenance. Because of the hot weather in summer, the metabolism in the human body is more vigorous than usual, which leads to a lot of perspiration, so the skin will secrete more oil, which is very unfavorable to skin health and will also induce some skin diseases. At this time, in addition to maintaining the necessary amount of drinking water every day, Qin Ying should also be used for cleaning. After the skin is burned by the sun, do not wash it with hot water, but with warm water. Pay attention to avoid spicy food in diet and choose fresh and light food. Citrus, tomatoes and cucumbers are all excellent beauty foods. At the same time, crude fiber food can help the human body eliminate waste and reduce the accumulation of toxins in the human body, so that it does not produce heat and fat. People with fair and dry skin are more sensitive to sunlight. Dr. Feng from the dermatology department of Beijing Hospital told me that generally speaking, people with white and dry skin are more sensitive to sunlight than those with oily and dark skin. In addition, some diseases will be induced or aggravated by sun exposure. The most obvious is lupus erythematosus. 30% patients with lupus erythematosus are sensitive to sunlight. These patients should try to avoid sunlight when going out, use sunscreen, open an umbrella or wear a wide-brimmed hat, wear light-colored long-sleeved shirts and trousers, and avoid taking photosensitive drugs. According to reports, the principle of sunscreen products is very simple, generally divided into chemical sunscreen and physical sunscreen. Chemical sunscreen is the use of its molecules to absorb ultraviolet rays, and most sunscreen products belong to this category. Physical sun protection is to cover the skin with opaque powder to form a protective film to scatter or reflect ultraviolet rays. Multiple sunscreens are more effective. You can use a sun umbrella and sunscreen at the same time, which is safer and more assured. Oily skin should choose water-based sunscreen products with strong penetration; Dry skin should choose cream-like sunscreen products; Generally, there are no strict rules for neutral skin, and lotion sunscreen is suitable for all skin types. Although chemical sunscreen is refreshing, it may make the skin allergic; Physical sunscreen products are mild, but the texture is thick. People with oily skin should use chemical sunscreen products, and people with sensitive skin should use physical sunscreen products.