Quote Originally Posted by drugaria View Post
well then the fall explains everything, It sounds and looks like a hematoma from the fall(probably a large blood vessel got ruptured when it hit the edge). It should go by itself after some time . Keep an eye on it and if gets bigger call the vet. If it doesnt it will take care of itself. I really can't think of anything else if you are saying it just happened.
Thank you very much for your help