Hi Dear, Welcome to HCM. Understanding your concern. As per your query sore tongue and canker sores in mouth which you are talking about is infection of oral cavity known as recurrent gingivostoamtitis which occurs because of reduced immunity of body or impaired immune system. It can also occur due to poor oral hygiene, stress and underlying systemic disease of body. I would suggest you to apply topical antimicrobial ointment on sores. Apply dologel on tongue and oral cavity. Avoid hot, salty, spicy and sharp food. Eat yogurt in diet. Apply small amount of milk of magnesia . Apply ice on sores near gingival area to subside swelling and inflammation. Brush teeth very slowly and gently. Visit oral physician once and get your blood reports examined and start treatment as per that as your blood count shows presence of infection in oral cavity.. Hope your concern has been resolved. Get Well Soon. Best Wishes, Dr. Harry Maheshwari