Spring is here, the earth has returned to spring and the grass is green. Although spring is beautiful, it is also the most frequent season for skin diseases, and allergic skin diseases are especially common, such as dermatitis, eczema and hives, which account for almost half of the dermatology clinics. So what causes skin allergies to occur in spring? First, the spring climate, especially in Shanghai, where yesterday you were wearing a cashmere sweater, today you have to wear a T-shirt, and tomorrow maybe a down jacket, is so hot and cold that it is difficult to balance the temperature of the skin, making it sensitive and susceptible to external stimuli. Secondly, in spring, when grass and trees are green and flowers are in bloom, people who are allergic to pollen or willow will sneeze, have red and swollen skin, itchy and other symptoms, which are caused by the tiny particles of pollen or willow that are scattered in the air and enter the airways and lungs, thus causing allergies, or direct contact with the skin. There is also the serious environmental pollution, dust and haze, the hidden mites or mite secretions, mold and other proliferation is also the culprit of spring skin allergies. The typical symptoms are itchy rashes on the face, neck, upper arms and low collar areas after exposure to the sun. Therefore, it is important to protect ourselves from the sun in spring to prevent UV allergies. In addition, the food we eat should not be underestimated, such as fish, shrimp, crab, shellfish, eggs, milk and photosensitive vegetables such as bamboo shoots, celery and quinoa (commonly known as gray vegetables) can also cause allergic skin disease, and people with allergies should try not to eat these foods. It is best not to change cosmetics easily because of the increased sensitivity of the skin in spring and cosmetics can easily cause allergies. In short, spring is the season of allergy, prevention should be the main focus, in summary, we should pay attention to the following points: 1, keep the skin clean, pay attention to skin moisturizing, enhance the skin’s resistance, can use fresh, hydrophilic skin care products, oil-containing skin care products should be used as little as possible. 2, do not randomly replace the daily use of cosmetics, or cosmetic allergies are likely to occur. 3, spring to pay attention to sun protection, go out to apply sunscreen (sunscreen index should be at least 30 or more, and the middle to reapply). 4, but also to reduce the impact of wind and sand on the skin, when going out with a sarong, mask and other cover. 5. Eat more fresh fruits and vegetables and drink more plain water. However, when allergies occur, you should immediately stop using any cosmetics, cleansers, wash your face with cool water, use cold water soaked gauze, avoid scratching and patting, sun protection is especially important at this time; diet, avoid spicy food such as chili, alcohol, onion and ginger, etc., drink more water. In serious cases, be sure to go to the hospital to let the dermatology professional doctor to avoid serious allergic dermatitis, and even disfigurement.