<s>[INST] Hi, Ive had a pilonidal cyst about 2 years ago that was so bad it had to be operated on.  Less than a year ago, it got inflamed but I was given antibiotics for it and it went away.  This past week, I experienced pain and took about 10 days worth of ciprofloxacin.  I have a very small painless bump where the cyst should be and am not sure if that means its going away or the medication isnt working. [/INST] Welcome to Chat Doctor. 1. The history and present symptoms suggest possibilities of the recurrence or bad healing of the post-operative cyst. Complications can to be ruled out.2. In this case you need to get it examined, and evaluate the healing process of the site and present cyst relation to the operative site.3. An ultrasound will help to evaluate if there is any inflammatory changes in the subcutaneous plane - like edema and abnormal vascularity.4. Ultrasound also evaluates the nature of the lump and its relation to the adjacent structures and source of lesion.5. Man while in small cyst wit less infective features a course of antibiotics will help.6. Maintain local hygiene and clean area with the antiseptic liquid, avoid disturbing the area, use soft clotting which can touch the area, and get examined. Good luck. Hope I have answered your query,anything to ask do not hesitate to ask.http://doctor.ChatDoctor .com/doctors/ Chat Doctor.  </s>