scab. 1  An incrustation over a sore, wound, vesicle, or pustule, formed during healing. 2  The mange, especially when it appears on sheep. 3  Any of several different diseases of potatoes producing pits and other damage on their surface, caused by streptomyces bacteria (but formerly believed to be caused by a fungus).
Diabetes complications from fungus infections in the toenails and fingernails can lead to amputations of the entire limbs. To understand how serious fungal toenails can be to a diabetic, you must first understand how diabetes affects the body.
Athlete's Foot. This fungal infection can cause peeling, redness, itching, burning, and sometimes blisters and sores. It's mildly contagious, spreading to others by direct contact or by walking barefoot in places like locker rooms or near pools. The fungi then grow in shoes, especially tight ones without air flow.