Welcome in H.C.M.
I had think over your query regarding white spots
on stitch line in frenuloplasty
operation. Though you are applying steroidal ointment over it but still it is looking like an ulcer.
Here I would like to tell you need not to worry, with due concent of your treating doctor you may add these in your treatment-
1- Antiseptic mouth wash.
2- Anti inflammatory.
3- Antibiotic (preferably broad spectrum).
Probably you will may get excillent response.