What does a pediatric rheumatologist do?

Many things. Mainly they take care of children with inflammatory joint disorders like juvenile idiopathic arthritis. They also are specialists in autoimmune disorders like systemic lupus erythematosis and periodic fevers and unclassified disorders like kawasaki disease, fibromyalgia, and raynaud's disorder.
Autoimmunity in kids. Pediatric rheumatologists are fully trained pediatricians who have had additional years of training & experience in order to effectively diagnose & treat most kids with chronic inflammatory or autoimmune diseases, particularly ones that invoke joints, muscles, skin, brain, gut, and other organs.They use medicines that alter the immune system to control white blood cells that attack their own body.