My 12 Year Old Son Has Down Syndrome. He Is

My 12 year old son has Down Syndrome. He is high functioning and generally in good health. This summer he got a staph infection that will not go away. He also got a bad jock itch that had gone away after medication but is back again. Now he has a huge wart in the palm of his hand. I am worried this is leading to some kind of autoimmune deficiency.