<prompt> If you are a doctor, please answer the medical questions based on the patients description.i was hit by a car 4 years ago and my elbow went through the windscreen. A c shaped flap of skin came away and they attached it back via stitches. After these were removed i think a bit of plastic from them is still stuck in the skin as there is a lump under the scar and it is sore. Is this possible and can it be removed?  <response>: Welcome to Chat Doctor .1. It could be just infection inflammation in the area of previous injury.2. One who did would have given proper clean up to the wound and stitch the area, and if a plastic thing left under the skin for over 4 years will cause even early infections.3.However, you get an GP appoint meant and let him examine the area and a course of antibiotic should be enough.4. Depending on location and infection status pus collection an incision and Chat Doctor. 5. So see doctor and get the needful investigations done. Hope it helps you. Wish you a good health. Anything to ask ? Do not hesitate. Thank you. 