There are various skin changes associated with elevated blood sugar, and the main common ones are as follows. The first, skin infections, such as the appearance of bacterial infections such as folliculitis and skin boils, but also fungal infections, including those with ringworm, gray nails, and foot odor. There are also viral infections such as herpes zoster, and this viral infection is the reason why many patients develop shingles. The second, pruritus. This symptom is also the most common type of skin lesion in combination with diabetes. Damage to the peripheral nerves that innervate the skin can lead to abnormal sensation. This, combined with the abnormal secretion function of the sweat and sebaceous glands, results in abnormal changes on the skin surface and therefore pruritus. The third, diabetic dermatosis. The fourth, diabetic maculopathy. All these skin changes are closely related to the elevation of blood sugar.