With the increase in the content of modern life and environmental pollution, the incidence of allergic diseases is increasing and the spectrum of diseases involved is becoming broader, and patients can present with changes in the skin, respiratory system, digestive system, and even the blood system. Today, we mainly introduce allergen testing related to dermatology. 1, eczema Eczema is a skin change caused by a variety of internal and external factors, involving inflammatory reactions in the epidermis and superficial dermis. The etiology of the disease is complex and is generally considered to be related to allergic reactions; its triggering factors often vary depending on individual factors and different stages of the disease, so it is not easy to determine. Analysis of its triggers can be divided into exogenous and endogenous causes. The former is common in food such as fish, shrimp and crab, and inhalation such as pollen, dust mites, animal fur dander, etc. The prevention and treatment strategy should be based on avoiding contact with various suspected causative factors and reducing the consumption of fish, shrimp, crab and other foods that are generally prone to induce the disease. 2, urticaria commonly known as “wind pimples”, is a superficial dermal or mucosal vasodilatation, increased infiltration caused by the limited surface, dermal edema disease. 15-20% of people occur at least once in their lives urticaria. The etiology of the disease is complex and common causes include food, with fish, shrimp, crabs and eggs being the most common; followed by certain meats and plant foods. Inhalation of animal dander, feathers and tree pollen can also cause urticaria. Therefore, to find out the corresponding allergens and avoid contact with them is the fundamental principle and measure of treatment. The actual fact is that the actual person is not a person, but a person who is not a person. There are many substances that can cause contact dermatitis, primary irritants and common sensitizers, some of which are sensitizers at low concentrations, but are toxic and irritating at higher concentrations. The sources of irritants and sensitizers can be divided into three main categories: animal, plant and chemical. Principles of prevention and treatment: First, the cause should be sought, disengage from exposure, and actively treat the symptoms. After healing, try to avoid re-exposure to the causative factors to prevent recurrence. 4, atopic dermatitis, also known as “atopic dermatitis”, has obvious genetic characteristics, often accompanied by asthma, allergic rhinitis, chronic recurrent, pruritic, inflammatory skin disease. In Chinese medicine, “tinea cruris” and “four bends of wind” may be the manifestation of different stages of this disease. This disease should pay special attention to the prevention and treatment of infants and children, reasonably avoid allergic foods, and avoid environmental stimulation of silver direct contact with the skin. 5, angioneurotic edema Angioneurotic edema is a kind of limited edema occurring in the more lax parts of subcutaneous tissue and mucous membranes, divided into two kinds: acquired and hereditary, the latter being rare. Patients with acquired angioedema are often associated with other genetic allergic diseases, and its onset can be caused by drugs, food, inhalants and physical factors. Prevention and treatment should be based on active search for the cause and removal of suspected factors, such as avoidance of allergy-causing foods.