I have tonsil stones and was extracting them and noticed two white patches behind each tonsil on each side of mouth. almost at the bottom of the palate-pharyngeal arch. is this just more tonsil stones? no pain/soreness. just looks the same both side?

Might be a good idea to see the ENT (Ear, Nose & Throat) Specialist to take a look at them and also to find out why One is a Stone-Former and what could be done to limit or stop more tonsil stone formation

There are a number of lesions, pathogens, infections, conditions that cause white lesions in the throat, tonsil stones being just one example. Any white area that has not self-cured in 2 weeks should be investigated. Recommend that you see an Ear/Nose/Throat specialist, an Otolaryngologist.