I am having this same issue post VSG. Two days after surgery I started with two and have had between 2-6 since then with some respite when I took dexamethasone and chlorhexidine Rx rinses. When I stopped taking the rinses though, they returned. We (Doctors & I) are wondering if it is a sensitivity to sugar/sugar alcohols/stevia/monkfruit. Any one else experience this and able to resolve the sores?