Frequent skin allergies may be related to contact with allergens, low immunity, endocrine disorders, mental factors and other factors. 1. Contact with allergens: contact with allergens is the most important factor in triggering skin allergies, which can enter the human body through skin and mucous membrane contact, inhalation, ingestion, injection and other ways, resulting in body allergies. When the patient is removed from the allergen, the inflammatory reaction can be relieved or subside. Common allergens such as animal fur, plants, soap, laundry detergent, cosmetics, insecticides, topical medicines, milk, pollen and so on. 2. Low immunity: people with low innate immunity are more prone to skin allergies than normal people. 3. Endocrine disorders: if the patient endocrine disorders may also induce skin allergies. 4. Mental factors: if the patient is overly nervous, long-term late night, psychological pressure, may induce skin allergies. There are many reasons for frequent skin allergies, and it is recommended that patients combine their own situation and go to a regular hospital for relevant examinations to clarify the causes.