Allergies itchy and red when you scratch. It is recommended to improve allergy symptoms through lifestyle adjustment and medication under the guidance of a doctor. 1. Lifestyle adjustment: Avoid contact with allergy-inducing substances in your life and avoid scratching the skin lesions. In addition, pay attention to rest, eat a balanced diet, appropriate exercise, and avoid anxiety and tension. 2. Medication: patients can apply glycerin lotion on the lesion area, and in serious cases, they can take anti-allergy drugs such as loratadine and cetirizine to improve the allergy symptoms. Drugs need to strictly follow the doctor’s instructions standardized use, vomiting, dizziness and other adverse reactions need to seek medical treatment, drug allergy is prohibited. Therefore, it is recommended to consult a doctor to receive standardized treatment for allergy when scratching an itchy red patch.