Hello! Thanks for using healthcaremagic.com I read carefully your question and understand your concern. I think you child may have Cellulitis . Cellulitis is an infection of the skin and the deeper tissues. Group A streptococcus is the most common cause. The bacteria enters your body when you injure your skin as in a wound, burn or surgical cut. While threat my patients i take a sample or cultive of the skin or do a blood test to identify the bacteria that is causing the infection. Treatment consists of oral antibiotics (by mouth) in the case of mild cases or intravenously (through a vein) in the most severe cases. Since you need to know which bacteria is causing the problem the medicine varies, so according each of my patient i recet to them Penicillin,amoxicillin, Clavulanic acid, clindamycin (or metronidazole). Kind regards, Dr. Oscar Martinez