Skin allergies are related to genetic factors, acquired factors and sensitive skin. 1. Genetic factors: patients with allergy-prone skin in their family may have allergy-prone skin in their offspring due to genetic factors, which is considered to be related to heredity. 2. Acquired factors: long-term overtime work and late-night sleep deprivation, irregular life, poor diet, work and study stress, emotional fluctuations and other factors, may be manifested in the body of the allergic reaction, which is also likely to occur in the skin. 3. Sensitive skin: If the body or skin is more sensitive, emotional fluctuations and hot and cold stimulation of the skin, allergic symptoms are likely to occur. It is recommended to reduce external stimuli and avoid excessive emotional fluctuations to minimize the occurrence of skin allergies. In addition to this, the destruction of the skin’s barrier, long-term application of hormone drugs, resulting in hormone-dependent dermatitis, is also the main cause of allergies. Frequent occurrence of allergies, it is recommended to go to the hospital for relevant examinations, if necessary, desensitization treatment, can effectively reduce the occurrence of allergies.