Illness related to mouth and lower body sores?

My boyfriend always have sores inside his mouth and on his lower body. The ones in his mouth look approaching ulcers, however he get them in mass quantites (almost 30 at a time) and they selection from the size of a pinpoint to the size of a dime. He gets them adjectives over the mouth (tounge, gums, throat, roof, etc). He also gets sores on his lower body (stomach, consume, thighs and butt). They look like red unfurl sores and are about the size of the diameter of a pencil. He say that the sores on his body are painful, but are nought compared to his mouth. It affects his eating traditions and speech because it is so painful. There are times when he hardly eats and doesn't speak for days because he is within so much pain. He have been to the dentist several times for laser treatment for his mouth, which works, but simply temporarily. Also, he said it seems to own gotten worse with age. They started when he be about 13- he is immediately 21. He says in a minute it is the worst it has ever be. Any ideas or suggestions? THANK YOU Ask your boyfriend if he have maybe be sexually active when he be younger, because he could have a sexual disease. Or possibly, just enjoy him go to a doctor and enjoy him tell the doctor EVERY experience he have had near the issue. Just a thought, I hope I helped.