In stitches, if there is any severe pain, warmth, fever, redness or pus like discharge then any infection should be thought of which requires a course of antibiotics and resuturing if needed.
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 doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.