No one is worried about the scar tissue, it is the damage that could be caused which you can avoid. You may watch, but there are certain things that you may not be able to avoid. But that is your choice and up to you and I have no problem with it at all. Many people feed snakes live for their whole lives.
I'd say any bite is worth treating. An infection will be far worse for him than picking him up for 30 seconds to apply some cream to him.