Tell me I'm not the only one

Those are pretty common when you're doing boxing, wrestling etc. They're called cauliflowerears.
Cauliflower ear is the result of a direct blow to the outer ear. Blood or other fluids fill the space in between and disrupts normal blood flow. The skin on the surface of the ear is the only blood supply for the cartilage, which gives the ear its shape.
So actually the author did some realistic things here :3

Ooooh thank youuu i didn't know (￣∇￣")