It does not really look like ringworm to me...more like a bite of some kind (notice the small red dot in the center)...

What does Lyme Disease signs look like for dogs? We have tons of ticks in the area but Lyme Disease is very rare (only 7 cases in LA in the last 10 years). I pulled two off me and one off her one day after a walk in the woods, but no real problems since. She is treated with Frontline each month.

She is getting a vet appointment first thing in the morning....so I guess we will findout then.