Hi, new to the site and would so appreciate any advice. I was bathing my dog today and noticed a dark red blister-type of bump on my dog's face. It's on the right side of his face, between his right eye and right whisker-area... It is about the size a pea, and feels like a scab. I wish there were a way I could post a photo... It is round, dark red, hard, slightly raised but more flat to his skin, and looks for the most part dry, with a little bit of liquid on the edges.