u/nightowlhttp

My sweet degu Zila, has a new bald patch on her head and the tip of her tail got (bitten?) Off. I think her sister has done it because they have faught to blood drawn before. But after i seperated her from the rest, the bald patch on her head has gotten bigger. I was thinking it could be from stress, but she obviously cant reach it with her teeth, and i dont think she has the strenght to pull it out with her paws. Does anyone have an idea how i should go about this?