Board Thread:False Info and Speculative Discussion/@comment-13895380-20150730232055/@comment-4295751-20150809220354

bite heals brain damage. Erica's epilepsy was fixed when she became werewolf.

and if we're talking about physical damage, then (I don't know if it counts but) kanima once pulled an arrow (which Allison shot) out of his head.. Also in Erica's first full moon, Derek put a head ring with screws to her head. Not sure how deep those screws went though, but seeing as humans can survive trepanation, that doesn't sound like a big deal for a werewolf now that I think about it.