Hello! I have been through your question. Related your concern i think this could be bullous erysipelas caused by streptococcus beta hemolytic. Usually this is common in diabetic patient( because of the fungi in foot that cause sores), immunocompromised patient and in patient with lymphatic obstruction. I suggest to do e physical examination by an infectious diseases specialist, to do culture of drain liquids in order to find the proper bacteria and to start as soon as possible Intravenous antibiotic( usually I prescribe ampicillin or cefazolin) for better result. I hope my answer helps you. I wish you a quick recovery.