1- Infections: a number of bacteria (the areas involved generally are hot, swollen, red, and painful. Most bacterial infections require treatment with oral antibiotics) &fungi (itchy red rashes, often surrounded by tiny blisters and scales; they most often occur in warm, moist folds of the skin; treatment involves keeping the area dry &using a combination of topical steroid and antifungal meds).
2. Diabetic Blisters (Bullosis Diabeticorum): a rare skin condition that causes blisters to erupt. These blisters resemble burn blisters and typically occur on the fingers, hands, toes, feet, legs or forearms, most often in those who have diabetic neuropathy (that is, nerve dysfunction secondary to diabetes).These sores are PAINLESS, and heal by themselves. The only treatment is to normalize blood glucose levels.
3. Eruptive Xanthomatosis: a diabetic skin condition that presents as firm, yellow, bumps about the shape and size of a pea. These bumps typically appear on the hands, feet, arms, legs, and buttocks and occur in younger males who have type 1 diabetes and poorly-controlled blood sugars, as well as a high level of cholesterol and fat in the blood. The bumps will disappear when blood glucose and triglyceride levels are brought under control.
4.Digital sclerosis: (digital for fingers & toes, and "sclerosis" means hardening). Here the skin on the toes, fingers, and hands become thick, waxy, and tight. Stiffness of the finger joints also might occur. Lotions and moisturizers might help soften the skin.
5. Disseminated granuloma annulare: causes sharply defined, ring- or arc-shaped areas on the skin, most often seen on the fingers, hands, and feet, but they can occur on the trunk. They can be red, red-brown, or skin-colored. No need to treat, but may need topical steroids if they don't improve on their own.