Patient: Patient female, 23 years old, duration of disease: more than 5 years, has been taking levocetirizine hydrochloride tablets, one every other day. Has been tested for allergens: household dust mite, crab. The symptoms disappeared after half an hour of taking the medicine, but I can’t stop taking the medicine. What are the treatment options and desensitization methods? Zheng Min, Department of Dermatology and Venereology, The Second Hospital of Zhejiang University School of Medicine: There are two common methods of desensitization for mites: subcutaneous injection and sublingual administration. It is more effective for children and adolescents. The efficacy for adults is less than half. Patient: How long does the course of subcutaneous injection take? How often does it need to be injected? Zheng Min, Department of Dermatology and Venereology, The Second Hospital of Zhejiang University School of Medicine: 1-2 years, once a week.