7-year-old girl breast itching, may be related to atopic dermatitis, breast eczema, urticaria, etc., need to be further differential diagnosis by the doctor. 1. Allergic dermatitis: If contact with allergenic substances such as underwear containing chemical fiber components may cause abnormal autoimmunity of the body, resulting in an inflammatory reaction in the breast area and itchy breast symptoms. 2. Breast eczema: pimples may appear on the basis of skin erythema, often conscious of significant itching in the breast. 3. Urticaria: patients often feel itchy skin, and soon the itchy parts of the red masses of varying sizes appear. Parents are advised to take their children to the hospital in time to clarify the cause of the disease and standardize the treatment under the guidance of the doctor.