There is no specific drug for the treatment of allergic rashes. Allergic rash is common in eczema, contact dermatitis and other diseases, commonly used drugs are antihistamines, anti-allergy drugs, hormonal drugs, these drugs need to be taken under the guidance of a professional doctor to avoid adverse effects. 1. Antihistamines: this is the main drug of treatment, the mechanism of its nerve inhibition can play the role of analgesia and itching, can be used in the treatment of rashes, commonly used drugs are chlorpheniramine, levosulpiride and so on. 2. Anti-allergic drugs: Vitamin C, calcium gluconate, etc. also have anti-allergic effect. 3. Hormonal drugs: the wide range of rash can be used to control the condition of internal hormone, such as prednisone. It is recommended to consult a doctor in time and standardize the treatment.