There is no such thing as low immunity causing itchy skin, itchy skin may be caused by eczema, hives, diabetes and other diseases, need to take medication for the cause of the disease and other ways to alleviate. 1. Eczema: itchy skin may be the manifestation of eczema, you can follow the doctor’s instructions for external use of glucocorticoid drugs, such as dexamethasone, hydrocortisone cream, etc., can reduce the itchy symptoms of eczema. 2. urticaria: urticaria caused by itchy skin, the first should eliminate the cause of the disease, you can take oral cetirizine, loratadine and other antihistamines under the guidance of a doctor, can reduce the allergic reaction as well as itching. 3. Diabetes: itchy skin may also be a symptom of poor glycemic control in diabetes, and can be prescribed oral insulin secretagogues, such as gliquidone, etc., which can promote pancreatic β-cell secretion of insulin, control blood sugar, thereby treating the disease and alleviating the symptoms. If itchy skin occurs, it is recommended that patients go to the hospital to clarify the cause of the disease and standardize the treatment under the guidance of the doctor.