I think I might have an abscess on my left quad. I injected 250 omnadrin and I know its hurt but Ive had an unusual lump that wont go away and its kind of painful, like not being able to bend my leg most of the way. I have antibiotics from knee surgery (cephalexin 500mg). I think Im going to wait a week more and if it doesnt go away start taking them. My question is you think they will help if its an abscess? And do you think they will interfer with my cyce 500mg omnadrin a week and 150mg fina eod?