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.
Most fungal nail infections occur as a result of the fungi that cause athlete's foot infecting the nails. These fungi often live harmlessly on your skin, but they can sometimes multiply and lead to infections. The fungi prefer warm, dark and moist places like the feet. You're more likely to get a fungal nail infection if you: 1  don't keep your feet clean and dry. 2  wear shoes that cause your feet to get hot and sweaty. 3  walk around barefoot in places where fungal infections can spread easily, such as communal showers, locker rooms and gyms. 4  have damaged your nails.