Ringworm is so contagious. Yes if you scratch hard enough to break skin the infection could start that way. But an infection from the ring worm itself you can't get a staph infection. Make sure you wash all clothes separate from other people. Bleach out his room, if you ever touch him wash hands right afterwards, have him sit in one place until the ringworm is gone. Do all you can to stop the ringworm right where it is or it will spread like fire.