Rarely a boil can become dangerous and expose to certain complications.
The occurrence of fever and / or the presence of lymph nodes (adenopathies) sign a loco-regional invasion, or general with a risk of sepsis.
A boil accompanied by fever must have a doctor consulted promptly. It is necessary to treat the infection seriously with antibiotics and to monitor the patient.
A boil on the middle part of the face, at the level of the wings of the nose and the upper lip, must be closely monitored and protected from skin manipulation (in light, be careful not to try to pierce a button located at this point). The risk of malignant staphylococcal disease of the face exists: the multiplication of staphylococcus extends and can cause thrombo-phlebitis of the cavernous sinuses (veins in the skull ...), and possibly meningitis: hospitalization and intravenous antibiotic therapy is introduced. This complication is very rare, fortunately!
To avoid any complication the best to consult early, to benefit from treatment quickly.