Urticaria, eczema, atopic dermatitis and other diseases are medically classified as allergic skin diseases. These diseases are common and prevalent and can be controlled when taking antihistamines, but many patients experience flare-ups soon after stopping the medication, causing great pain to the patient. It is difficult to change the patient’s allergic constitution, so to avoid recurrent attacks of these diseases at the root cause should also actively seek out allergens and avoid substances that cause allergies. Common allergens in life include pollen, dust mites, animal fur, fish and shrimp, etc. People with allergies are better off not having pets, and if you really can’t do it, it’s best not to let pets into the bedroom, and often vacuum the room where pets are active, and bathe them regularly to reduce the amount of dander, urine and dry saliva. People with a history of allergies may want to keep a record of what they were doing, where they were or their surroundings when they developed allergy symptoms, which may be helpful in finding the allergen. For many reasons, not every allergy sufferer can find the allergen at this time, so many times the only way to help is to have blood drawn to find the allergen.