This could be due to virus, stress or deficiency of vitamins or both... So start up taking multivitamin / b complex and vit c for quick healing, each once daily ...
If those doesn't give any relief pls visit a dentist showing ur medication u used ..
And after doing some examinations he/she will prescribe anti viral
Next Steps
have a balanced meal ... and reduce stress ...try to have a sound sleep..
Health Tips
pls check for relief ... else contact dentist (SOS)