The inside looks normal except a little brown on the edges. The dark fur part fell off and the skin underneath looks normal but a little red so I'm thinking it was a burn. He probably jumped on the stove or something in pursuit of food >_<
I'll keep an eye on it. Thanks for the replies!
Noticed this spot on the cat's ear a couple days ago. I thought it was dried soap because he sometimes gets under the auto soap dispenser. But it's dark around the edges and the fur is peeling off. He's a 5 year old indoor cat and we don't get a lot of sunlight in the house. Could it be a...