This is the place to post questions and discussions on usage and style. The members of the Wordwizard Clubhouse will also often be able to help you to formulate that difficult letter.
Both responses sound natural, however, if A was a smart-ass, he might correct B's first answer to "...healing up pretty well" A's question doesn't sound quite as natural. You might hear that from a doctor, but from a friend it would more likely be "How's your finger/leg/eye?" or "How's that cut/bruise/sprain?"ACCESS_POST_ACTIONS