Sorry, I didn't post any sooner. The vet said the blood test result is normal, he said Ruby's thyroid is a little on the low end but, it is normal. He said to continue to watch the area and if anything changes call him. It's been 2 weeks and the area haven't change much. Although 2 days ago, I thought part of the ring looked like it was fading but today it looks like a ring again. The weather has been cold here yesterday and today so I'm wondering if it's weather related. Ruby is still acting his normal self. Don't know what it could be. Thank you Stephanie for all your info.
E