Hi,
Just clean the trunk, keep the trunk dry (if raining, try to protect the tree from the rain), and see if the trunk heals .
For the rats - by dry weather - put some gypsum (powder) around the pots. The idea is the rodents will walk on the gypsum and get that on their feet.
Because they like to be clean, they will lick it ... and more than likely, you won't see them again ... If you see their holes, put gypsum there too.
I wouldn't worry for those wounds . But, I would avoid to get new ones, so use gypsum and all traps you have.