The most important principles are to remove the cause, control scratching and avoid stimulation. General prevention and treatment include the following points: 1, as far as possible to find the cause of the disease, can be avoided should try to avoid the cause. Avoid all kinds of easy to cause sensitization and stimulating food, such as fish and shrimp, strong tea, coffee, alcohol and so on. 2, avoid all kinds of external stimuli, such as hot water scalding, violent scratching, excessive washing and so on. There are many people who like to use hot water after allergies, washing with salt water or pepper water, or simply scratching desperately until scratching bleeding, further stimulation will lead to the occurrence of a vicious cycle, the deterioration of skin disease. 3, some patients with clear allergens can be desensitized. When allergy occurs, the main symptomatic treatment, including giving anti-allergy treatment, and oral or intramuscular injection of various anti-allergy drugs, at the same time can be given some corresponding topical drugs such as glycerite lotion or hormone topical drugs. For those who are allergic, some common anti-allergy drugs such as paracetamol, imipramine, cetirizine, loratadine, etc. can be prepared at home, and in case of allergy, taking the above drugs according to the instructions can achieve effective relief. However, if severe respiratory distress or even shock occurs, urgent treatment in the hospital is required, including the administration of appropriate amounts of hormones. How to avoid allergies 1, often allergic people usually belong to the allergic body, this kind of body is unchangeable, the best way to prevent skin allergies is to reduce contact, go out and try to do a good job of protection. Allergy-prone people should reduce outdoor activities in the spring, less to the pollen, willow more places to go. 2, do not eat food that may cause allergies, try to cook what you eat, and eat as little seafood as possible. 3.Maintain indoor temperature, humidity, try to avoid contact with substances that may cause allergies, try to wear cotton, soft, loose clothing. 4, the newly renovated house contains formaldehyde and other chemicals, need to be ventilated for a period of time to live. 5, clean home comfortable indoor environment than the natural outdoor environment is more unfavorable to allergies, home with a variety of textile furniture, pillows, carpets, closed windows, as well as warm, humid space contains many kinds of allergenic substances, therefore, the need to carefully clean up the home where the allergens are gathered (bedding, carpets, kitchens, restrooms and other damp places and air conditioning filters are the most likely location), and then clean them. Then wash them well. 6, keep the skin moist, maintain the skin barrier function, you can apply some skin care products.