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High blood sugar also impairs the functioning of white blood cells, which defend against bacteria and are important for wound healing. The elevated blood sugar levels that cause your body to lose fluids through urine can make your skin dry and cracked and susceptible to sores and bleeding.

Signs and Symptoms of Type 2 Diabetes

Intense Thirst
Diabetes produces extreme thirst because the body is trying to compensate for the presence of a high level of sugar in the blood by sending a signal to the brain to water down the blood to dilute the sugar content and prevent dehydration. This mechanism translates into thirst that can't be quenched.

Increased Urination
Extreme Hunger
Fatigue
Unusual Weight Loss
Blurred Vision
Infections
Sores That Don't Heal
Source: The American Medical Association: Guide to Living with Diabetes