Infections with rabbits can be really dangerous because penicillin does not work with them because of a certain enzyme in their puss. I know it can be annoying when people say this, but you should take him to the vet if it does not go away, because animals can die from infections. It could just be a pimple, but I've never seen a pimple on a rabbit before. Usually people drain out an animals infection and then treat them with penicillin, but that will only cause the infection to spread with rabbits. So I would take him to the vet.
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