Worried!! Missing Fur

Hello! one of my boys is missing a lot of hair by his hip/back. also, two ugly scabs the size of dimes. I immediately assume he was bored or depressed, picking his own fur to the point of bleeding. I gave him a huge dust bath, and slept on it. The only negative display is boredom, other than that happy and playful. Now I am worried after researching that he could have Ringworm, or some other type of contagious irritation. I haven't really been able to eliminate anything but fighting. Would a chinchilla gnaw/chew/self hurt to this point? Is this a case of ringworm? I don't know what to do!!

These pictures will reveal more than I can explain.
http://ift.tt/1omva5l