Hi, Welcome to icliniq.com.
I understand your concern. It might be just a simple case of a complicated extraction socket or maybe even a sinus issue that is causing the leakage, given that the extraction site has not healed properly and is probably giving out the pus or the fluid consistency leaks into the soft tissue that is your gums. A cutaneous fistula in the mouth is pretty rare, in my opinion. I would prescribe simple measures to follow for your case based on your clinical symptoms. However, if you do not have any improvement, even in 15 days to one month, you can always approach me because we need to implement these first. Start lukewarm salt water rinsing every day around 5 to 6 times. This will ensure a bactericidal effect in your mouth. Switch to Chlorhexidine gluconate mouthwash every night before sleeping. I would also advise you to use gels like Metrohex (Chlorhexidine gluconate and Metronidazole) or Dologel CT (Choline salicylate) for topical application over the blistered areas because they are like Metronidazole or Dolo combination that will act locally on the gums to relieve you of the local infection there whatever it is. Finally, if you need antibiotics or antioxidant therapy, I can start right away because it will not interfere as such with your thyroid medication. Also, regular antibiotic prophylaxis is the only non-surgical way to treat post-operative dental complications. Therefore, if you want me to prescribe it, I can suggest it now. I would suggest that after following these prescribed medicines and measures like regular saline water rinsing and Chlorhexidine mouthwash and gel application, if the area still shows these inflammatory symptoms, then you are definitely right that it may be a fistula kind of complication. Therefore, you might need to consult a maxillofacial surgeon who can do a biopsy or verify through CBCT (cone beam computed tomography) or CT (computed tomography) once more to check for any such tracts in the mouth or from the maxillary or paranasal sinuses.