You seem educated enough to understand that the chemist is not trained to "prescribe" medicines, he is just licensed to "dispense" them. So please don't play with your health by taking random medications. B complex and lactic acid supplements do not cure ulcers, contrary to common belief. They do improve the tissue integrity but will not give any relief of symptoms to the current situation. And kenacort on the other hand is a steroid and should be avoided unless prescribed by a dentist or a physician. Please visit a dentist for a proper clinical examination and a proper advice on the treatment plan. Regards.