Rabbit Stand Blueprints My Rabbit's Ears Always Stand, 2day I Noticed 1 Ear Hangs Like A Dead Leaf While D Other Looks Fine. Plz Help!

My rabbit's ears always stand, 2day I noticed 1 ear hangs like a dead leaf while d other looks fine. Plz help! - rabbit stand blueprints

It seems to eat and run. There is no obvious wound or redness or swelling near the ear. When I try to help the ear to his feet, only takes a few seconds again before. It seems that the bone is broken or something. Please give me some advice about what to do. Thank you very much.