I have some photos if you're interested in helping me.
If it is raised sacra then it can be due to hypertrophic scar or keloid. You can upload some pictures in your profile so that it helps in understanding your condition better and I can help you in a better way.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your dermatologist. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.