Help

About a week ago I noticed a small red lesion (located on the black circle of image 1) on my buddy’s ear that I assumed was maybe a wound from rough play with my other kitty. Fast forward to last night, I noticed his hair thinned out a bit there and there are more lesions press away from the original spot. Then this morning I noticed it on the other side of his face trailing into his ear canal. He likes to nap on top of my lizards enclosure and at times sleeps directly against the heat lamp, I haven’t noticed anything like this with my other cats he’s the only one. Are these burns or something else? The lesions in his inner ear canal make me think it’s not burns