I wanted to follow up with you to see how you were doing, any updates on your issue or did the doctors find anything else out. My girlfriend has diabetes and they often have to change antibiotics on her just to get one to work because yes her body gets used to the medicine and then doesn't respond to it.
That is the problem with bacteria or other causes, they can become immune to antibiotics and the cream you are using is no longer affective.
I have a problem at times with abscesses too. Mine are caused by things I am allergic to and when I come into contact with something....... mostly food and UV rays from the sun, my body uses the fastest exits to get rid of my reactions to it. I don't know what is causing your abscesses but the only thing I can use is pure aloe vera (from an actual plant). It works for me which is wonderful as I cannot tolerate antibiotics even in a topical form. I have even used aloe vera on some strange skin growths that the doctor didn't have a clue what they were and it cleared them up. It usually takes a few days or perhaps longer to work completely but I can usually feel a difference within 24 hours. I don't stop using the leaves until it is completely gone.
As seattlemom said ..if you have Diabetes or some other health problem you might think about talkng to your doctor about this new developement. Especially if you are taking any kind of drug, your body may be reacting to it in a bad way.
Did a doctor prescribe you an antibiotic for this issue or did you just put antibiotic cream on it? What did the doctor say caused the abscess? And do you have any other health issues like Diabetes that might affect your healing?