That sounds like it hurts! I hope it gets better and I'm pretty sure Chester didn't mean any harm.
A similar thing happened to me when I adopted Jack & Sunny.
We'd only had them a couple of days and they were still nervous, so I picked Jack up and he saw himself in the mirror, he growled and whispered 'shhhhh' in his ear and he went mad and attacked my face, I had a cut down my right temple and a hole where he clawed me!
I know he didn't mean it though, and naturally we persevered and he's the softest thing anyway, you can literally hang him upside down and he doesn't care!