1, allergic skin diseases: the most common allergy category is seasonal dermatitis, urticaria, eczema, etc.. Seasonal dermatitis, also called seasonal contact dermatitis, mainly in the face, especially in young and middle-aged women, often related to pollen allergy and exposure to cosmetics, the performance is the facial erythema, papules, severe edema and blisters, etc., with more obvious burning and itching, can be accompanied by dryness and flaking. Another is mainly due to insect bites caused by papular urticaria, the human body, especially infants and children who are bedbugs, fleas and other bites, prone to allergic reactions, the rash generally 1 week to 2 weeks to fade, and leave temporary pigmentation. 2, infectious skin diseases: such as viral infections caused by chicken pox, hand, foot and mouth disease, rubella, measles, etc.; bacterial infections such as folliculitis, acne. On the one hand, this is due to the spring dry sandy, some air floating objects such as PM2.5 carrying viral bacteria contact opportunities increased, on the other hand, after the temperature rises, the human body’s sebaceous glands and sweat glands secretion began to increase without a corresponding increase in discharge function, resulting in the possibility of increased infection. 3, solar skin diseases: such as polymorphic sun rash and skin easily tanned. The UV rays in spring are significantly stronger than in winter, and people wear less, and do not have the habit of trekking and sunbathing, which increases the exposure, and lack of protection against the less intense (compared to winter) sunlight in spring, and at the same time, the human skin is still in that low UV environment in winter, and it is not adapted to this situation at once, which leads to inflammatory reactions outside the purple line. 4, psychiatric skin disease: Spring is the season of psychiatric diseases are prone to recurrence. The reasons for this, one is related to the climate, spring, low air pressure, weather changeable, easy to cause the human brain secretion of hormone disorders, human mood fluctuations, resulting in mental disorders and other mental illnesses are prone to relapse; secondly, spring is the beginning of the year, this time everyone is facing a lot of new tasks, new work, so that people under increased pressure, easy to make depression, anxiety and other mental symptoms aggravated; mental factors prone to physical and mental The mental factors tend to aggravate or recurrence of skin diseases, such as neurodermatitis, psoriasis, vitiligo, hair loss, vulva-anal itching, etc.