Hi! I noticed a few days ago that one of my chickens had some black spots on her comb. Over the next couple days I noticed it on more chickens. It ranges from looking like specs of dirt to bigger issues. I have attached pics of both. The chickens seem to be acting fairly normal... Eating drinking active ect. I have been trying hard to keep the coop extra clean and make sure their water is fresh. Also added electrolyte water in a separate container as an option. Thoughts?