I'm 26. I had my tonsils and adnoids removed when I was 5. Because of this, I've battled infections my entire life. Strangely enough, right after my tonsils were removed I started developing large calluses on the sides of my big toes. They spread throughout the years and basically cover the bottoms of both feet and are very painful. Because of my weakened immune system I've struggled with viral and bacterial infections, fatigue, weight gain problems, and the list goes on. Please don't let this happen to your son! If he's having digestive disorders, I would recommend:
1. Change his diet to one with more wholesome, living foods and cut out refined flour and Sugar (tough one but it will be the best thing you could possibly do for him)
2. Order a parasite cleanse for him from Humaworm. He's got a forum on this site. I'm almost finished with mine and it has been highly effective.
3. Supplement with probiotics when you're done with Humaworm.