Hello there, I am dr.milan an infectious disease specialist answering your question, I feel that this is clear cut case of infection. It might be hospital acquired or may be other type. Mostly this type of picture after such a long time is seen in infection like gram positive staphylococcal, atypical mycobacteria, fungus or may be some other gram negative organism. So now you must go for culture examination of infected site by a reliable microbiology laboratory and by a qualified microbiologist. Once the causative organism is found it can be treated according to its sensitivity pattern. Hope i have given appropriate guidance to you. if you have any query you can consult me anytime. Give me star rating according to your satisfactory level. Thanking you.