High blood sugar has the potential to cause itchy skin. This is because diabetics have poor immunity and resistance, and high blood sugar in diabetics is a good medium for microorganisms. There are many diseases that cause itchy skin, such as fungal infections, allergies, hives, drug dermatitis, psoriasis and various types of dermatophytosis, to name a few. People with diabetes may be more susceptible to skin disorders, and some itchy skin caused by high blood sugar is likely to be a result of both of these skin conditions. Therefore, high blood sugar can lead to itchy skin, but not necessarily the direct cause of itchy skin, the need for strict control of blood glucose, and go to the dermatology department for further consultation, diagnosis and comprehensive treatment.