Another year March day, swallows murmuring peach blossom, willow clinging to the air dance, a thousand charming spring breeze cut. However, some people cannot enjoy the warmth of spring to the fullest. Whenever spring comes, the skin will be dry, red spots, pimples, peeling, with itching, severe sneezing, itchy eyes and nose or coughing, with the usual two people, in fact, she is suffering from allergic dermatitis. Recently, the number of patients with allergies in the dermatology department has been increasing. With the increase of pollen, dust, microorganisms and parasites in spring, dry air, frequent climate change and enhanced ultraviolet rays, all of these can cause allergies to occur more frequently. Common allergens can be broadly divided into inhalant allergens, ingestive allergens, contact allergens, etc. Inhaled allergens such as pollen, dust mites, dust, mold, animal dander, etc. Ingested allergens such as milk, eggs, peanuts, seafood, mangoes, nuts, certain drugs (penicillin, sulfonamides, etc.), etc. Contact with allergens such as metals, fragrances, chemical additives, dyes, formaldehyde, paints, etc., as well as physical factors such as ultraviolet light, hot and cold air, wind, etc., can be the culprit of human allergies. The most common skin allergies in spring are atopic dermatitis and contact dermatitis. The common reactions are erythema, edema, papules, thin flaking, or mild surface thickening, often accompanied by itching or tingling, on the face, neck, and other exposed areas. Another common allergic skin disease is urticaria, commonly known as “wind bumps”, which manifests as an edematous red or pale red bumps on the skin and mucous membranes, which may appear and disappear repeatedly, accompanied by significant itching, and may involve the respiratory or digestive system in severe cases. When skin allergy occurs, it is recommended to go to a regular hospital and under the guidance of the doctor, with the adjustment of daily skin care to achieve the effect of “desensitization” of the skin as soon as possible. First, identify the cause of the allergy and try to avoid re-exposure to allergens. For example, if you are allergic to pollen, trees, or weeds, close windows during pollen season, avoid outdoor activities or travel, and wear a mask to avoid contact with pollen. For those allergic to dust mites: use special bedding for dust mites and avoid using blankets, woolen scarves, stuffed toys, etc. as much as possible. For patients with UV allergy, you should apply sunscreen appropriately when traveling and use a hat or parasol to block the sun when traveling. Do not use overly hot water and alkaline soap to stimulate the skin when bathing. Use cotton as the main material for intimate clothing. In addition, the diet should be light, avoid eating fishy and greasy food, and eat less irritating food such as chili, onion, garlic, etc. to avoid triggering and aggravating the symptoms of skin disease. Secondly, for skin allergy, clinical treatment is mostly combined with internal and external drugs. Oral medications are mainly antihistamines, such as kairetan and centrum, which are easy to take and have fewer side effects. Vitamin C and calcium gluconate can also be applied. For some acute generalized and severe symptoms, if the effect of general treatment is not good, glucocorticoids can be taken for a short period of time, but should be applied under the guidance of a doctor. Topical drugs are preferable to mild, non-irritating drugs. If the acute period can be used solution cold wet compress, external moisturizer, try not to use corticosteroid ointment, to avoid the formation of hormone-dependent dermatitis. In addition, appropriate exercise, maintain a happy mood and sufficient sleep can help improve your immunity, reduce the reactivity of the skin and reduce the occurrence of allergic reactions.