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.
The infection can be caused by bacteria, viruses, fungi, or parasites. Joint infection caused by fungi or parasites is much less common than that caused by bacteria or viruses. Typically, septic arthritis affects a single large joint, such as the knee or hip, but it is possible for several joints to be infected.