Summary of case history,　Huang, female, 3 years and 5 months old, came for a consultation on November 15, 2021 due to 'cough for 1 month'. Current symptoms: Coughing, less phlegm, mainly coughing in the morning and night. Systemic rash, dry skin, obvious itching, easy to wake up from 1 to 3 a.m. Slightly afraid of cold, without sweat, able to drink, not thirsty, not fond of drinking, dry stools, travel 2-3 days. I have a history of atopic dermatitis for over 2 years.,TCM diagnosis,　Cough disease (Syndrome of external cold and internal drink),Western medicine diagnosis,　1. Upper respiratory tract disease 2. Atopic dermatitis.,Therapeutic methods,　Based on the pathogenesis, formulate treatment methods and principles: relieving external symptoms and dispersing cold, warming the lungs and transforming fluids. Prescription: Use Xiaoqinglong Tang with added or reduced ingredients and alternate with Guizhi Mahuang Half Soup. Increase or decrease the dosage according to the condition.,Clinical outcomes,　After 3 months of treatment, the cough improved, the skin was smooth, and one could sleep all night. It has been more than a year since discontinuing medication, with a significant reduction in colds, improved rash, smooth skin, normal sweating, no longer waking up at night, and normal bowel movements. This case was initially aimed at treating cough, with accurate differentiation of symptoms and signs. It inadvertently cured many years of skin diseases, and achieved the effect of 'treating different diseases together' by 'unintentionally treatment achieves therapeutic effects'.