What are complications of furuncle?

Anthrax (conglomerate several boils), furunculosis (chronic boils triggering factors DM/IC), primary abscess, lymphangitis, systemic complications (very rare bacteremia, sepsis), malignant staph of face (emergency, rare, pt manipulates his furuncle of the face usually near labia/nose, causes general staph infection, fever, edema, palpable venuos cord, lead to septic thrombophlebitis, and more severe thrombophlebitis of cavernous sinus [deadly]