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 are caused by the same type of fungus that causes athlete's foot. Fungi grow best in warm, moist places, and they can spread from person to person. You can get a fungal nail infection from walking barefoot in public showers or pools or by sharing personal items, such as towels and nail clippers.f you have athlete's foot, the fungus can spread from your skin to your nails. A nail with a fungal infection may: 1  Turn yellow or white. 2  Get thicker. 3  Crumble and split, and it may separate from the skin.