Sir, please visit your dentist. Stitches might be tight ,that's why you are feeling scratches and pain.
Please do the warm saline (add a pinch of salt in a glass of warm water) rinses 4-5 times a day, there may be food lodgement there. It will clear it out.
Next Steps
Try warm saline rises and hexigel ointment there.
if don't feel good in a day, visit your dentist.