dear user i would like to tell you that rashes your son has may be because of some factors..... if he had administered medications rashes may arise from allergy of these medications.......certain food or drinks may cause allergic reactions of his body and corrosions of intestinal mucosa that causes this diarrhea............ there is suggestion of chicken box infection that need to see your doctor..... also sometimes rashes follow high fever or bacterial or viral infection as his immune system begin to red of that infection and immune reaction occurs that result in appearance of rashes and i think this is important may led to his symptoms ...........thats great from you to have illustrations about your son health ................ hope that i helped you