Common skin allergies include eczema, urticaria, drug rash, contact dermatitis, etc. There may be different degrees of allergic symptoms such as itching, rash, redness and swelling. 1. Eczema: Characterized by polymorphic rashes, such as erythema, papules, crusting, cracking with mossy changes. Conscious itching is obvious, often recurring. 2. Urticaria: characterized by erythema, wheals with itching, the rash can subside within 24 hours, and it comes and goes. 3. Drug rash: it can be caused by any drugs, with antipyretic, analgesic, sedative, sulfonamides and antibiotics caused by drug rash cases are common. Its common characteristic clinical manifestations include fever and chills, itchy skin, generalized erythema and edema. 4. Contact dermatitis: it often has a history of contact, common in the exposed parts of the body, most of the acute manifestations of the disease, with edema, blisters, erythema common, remove the cause of the rash can subside. Allergic manifestations should be timely consultation, identify the cause, and follow the doctor’s instructions for treatment.