Hello I would come up with these possibilities , for these boils , these includes. 1 Carbuncle , this is an infective gangrene of the subcutaneous tissues, due to staphylococcal infection. Carbuncle often occurs in the nap of neck , where the skin is coarse and ill-nourished.In this subcutaneous tissues become painful & indurated &the overlying skin is red. When such type of patient visit , I advise them to take cloxacillin 500 mg every 6 hourly for 5-7 days . 2 Boil ( syn. FURUNCLE ) A boil is a acute staphylococcal infection of a hair follicle , with perifolliculitis which usually progress to suppuration & central necrosis ( as may be in your case). 3 Impetigo is an intradermal infection . Physical examination will find out the exact nature of infection. In this type of condition reason may be many as diabetes or skin infection . So get in blood examination for blood sugar level and also get swab examination from these multiple skin infection. Usually this type of boils responds to cloxacillin and cure within 5 - days . If don t relief within this period , consult a skin specialist and get his opinion. Good luck.