High blood sugar can dry out your skin and curb your immune system. This raises your risk of skin infections, with staph (staphylococcus) being the most common. You might have styes on your eyes, inflamed hair follicles (folliculitis), or infected nails. Talk to your doctor if your skin feels swollen, itchy, painful, or hot, especially if you know you have high blood sugar or diabetes.
Fungi, like bacteria, love to hang out in the moist folds of skin. That includes your armpits, under the breasts, around the nails, and the corners of the mouth. You may have heard it called athlete’s foot on your feet, jock itch around your genitals, or ringworm on your scalp. Candida albicans is the most common fungus that causes it. Your doctor can help treat the infection and tell you if it’s a sign of uncontrolled diabetes.