<s>[INST] I recenlt had surgery to remove an abdominal abscess. It's three later and I noticed a lump above where my drain was on the front right side of my abdomen that moves in and out.  I can really feel it when I lay on my back.  It doesn't hurt but I am really concerned.  I just finished my oral antibiotics callled flagal and have to call the infectious disease specialist for an appointment on Monday.  My question is what is that lump and should I be worried [/INST] Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. The lump above surgical wound suggest possible subcutaneous collection in form of serum or else. I recommend to call immediately your surgeon's office and discuss the same. Hope I have answered your query. Let me know if I can assist you further. </s>