So, a few minutes ago I was letting my rat play around in my room freely while I cleaned out the cage. I heard a really loud scream come from underneath my bed. At first I thought she was playing with her sister but then she repeatedly screamed as if she was hurting. i quickly ran over to find her and she had got her tail stuck in between the bed and head board. I carefully pushed it back and she was free, but now she has an open wound on her tail. I don't know f I should leave it to heal its self or I should use something on it?