There are many types of sutures used in surgery and they are made out materials that are considered mostly inert. The main differences are whether they are dissolvable or not and whether they are braided or monofilament. Dissolving sutures are expected to break down over a certain period of time (ideally after the results of the procedure have become fixed). Braided sutures have the advantage of usually being softer and more flexible, but they also can fester if any bacteria finds its way into the material. Sutures under tension or in mobile areas can break or work their way to the surface. Dissolving sutures can sometimes cause a reaction to the suture material as it liquifies. Without a prior history, these effects are not always anticipated and any suture can potentially cause a reaction. I would find out what type of suture was used and avoid it in the future if your tissues appeared to react to the material. Hope this helps.
