hello, I have an 18 year old son who has ongoing issues with mouth sores. He began at around age 11 when he woke with swollen lips, it looked as if he had a beak. He was dizzy, hot and just not feeling well. The Dentist prescribed a mouth rinse and to avoid acidic foods. It happened only a couple more times, but he has ongoing mouth/cancer sores inside. Is this a serious condition? He is asthmatic as well.