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 usual indication for a first ray amputation is an ulcer beneath the first metatarsal head that has penetrated the MTP joint capsule. Often, only a portion of the head need be removed with the great toe to eradicate the infection, leaving all uninfected portions of the head and shaft.