Recently we noticed Sammy has a few reddish spots in his coat on his elbows. The spots have bumps on his skin. We also noticed the reddish color under his chin area as well. We recently changed his food about a month ago from Kirkland puppy food to the Kirkland chicken and rice adult dog food as he just turned 1 year old. He hasnt really been licking these areas or itching a lot or anything. Stools are fine too. Any ideas?

Thanks
Sean....