With the progress of society and economic development, lifestyle has changed a lot, the people’s demand for quality of life is also higher and higher, facial problems are more and more, and more attention is paid to (more visits to the doctor to see the doctor), especially women, but also to become an unregulated beauty hospitals to earn money in the market. Facial itching, erythema, papules, capillary dilatation, acne, hyperpigmentation and other manifestations of complexity and rapid change. To know, allergy in the performance of many characteristics: 1, allergy must be for 1-2 kinds of substances rather than allergic to anything, if contact with many drugs, cosmetics or food can induce symptoms, no selective, obviously not allergic to heat or agitation aggravation is obviously not allergic to heat and agitation is not allergic to allergens and allergens “difference of ten thousand eight hundred thousand miles! “; 2, allergy is an inflammatory reaction, must be a serious itching intolerable, and other skin sensations are not important, if not itchy or slightly itchy, but feel swollen and congested fever, these are not allergic manifestations; 3, allergy must be a very fast onset of allergies, once contact with the allergic substances in a few minutes or a few hours on the onset of the use of skincare products for a few days or a few months or even a longer period of time, it must not be caused by skin care products. Must not be caused by skin care products (note that cosmetics of unknown origin contain hormones, the use of long time will induce erythema, etc.). At the same time after the symptoms if you do not continue to contact or use, must subside very quickly, and can subside on their own; 4, allergy must be to leave the allergen will no longer attack. At the same time facial allergy problems are mostly local use of drugs or cosmetics, or photosensitive food (photosensitive contact dermatitis), airborne allergens such as the presence of airborne house decorations, pollen, dust mites, etc., the chances are more, food is not very important. If caused by oral medications or foods (except photosensitizing foods), it will not be limited to the face alone. Nowadays, a significant percentage of doctors just use allergy or immune out of the question, and then fool the patient, this I am very uncomfortable with. They don’t even know what allergy or immunity means, so they just explain it to their patients. Please, if you have facial problems, you can check yourself to see if the above 4 characteristics are met. If not, obviously can not be explained by atopic dermatitis, this will need to find an experienced doctor to further analyze what exactly is wrong with the face. Facial problems are complex, involving infections (e.g., bacteria, viruses, mites), sunlight (e.g., ultraviolet radiation), sebaceous gland-related disorders (e.g., seborrheic dermatitis, acne), vascular hyperreactivity (e.g., rosacea), allergies (e.g., various types of contact dermatitis), part of other diseases in the body (e.g., atopic dermatitis), neuropsychiatric factors (e.g., neurodermatitis), etc., of which allergies account for a very small portion of the pathogenesis. part, this has been exaggerated. Incorrect explanations bring about incorrect tests and unnecessary treatment or even desensitization.