This sounds kinda strange, but my husband gets ulcers (which look like blisters) in his mouth and throat. He gets them from eating acidic food! We bought a huge box of oranges at Costco and after a week, he was miserable with ulcers in his mouth; ended up giving the entire box away to people at his work.
I'm not sure if your son's ulcers are caused from the same thing, but it might be worth a try to cut out all acidic food; oranges, orange juice, tomato sauce (so no spaghetti, pasta with red sauce, and KETCHUP!), etc. Give him bananas, meat, potatoes, that kind of stuff. I think strawberries are pretty acidic too. You can look it up online to get a better list... I'm no expert. :)
If you cut those foods out, they should get better in a few days, at least enough so that they aren't hurting him so much. I agree with your dr though; 5-7 days for them to completely heal.
I feel for you - it's no fun. Hope he gets better soon!
at 9:25 AM on Jul. 15, 2009