I agree with cricket- look into PANDAS- my son has it and if you can catch it early- it REALLY helps treatment!!! Let me know if you have any questions!!! The rash could be strep- do a blood test to check for titers!!! ASO and Anti-DNASE B. There is more i would throw in there i can let you know if you do go down that path. It is really worth testing!!
Brandy