Question: About three weeks ago I was running with the dog on a leash and tripped and fell in the street hard on my right side and underarm towards the back because of the outstretched arm. I had very painful bruising but (without visible bruises) and the x ray showed nothing special. Strangely about two weeks later and a week ago the whole of my right side where I fell went blue black with enormous bruises all down my right side from under arm almost to waist and right round towards my chest and back. after a week most of the bruising cleared as did most of the pain although I still have a little when I move my arm but now I have a small mass / soft lump under the skin on my right shoulder blade and towards my right side about the size of a the palm of a hand almost liquid in feel . What is it?

its now been 25 mins since this question was posted - I XXXXXXX an answer soon please