Posting here for traffic. I'm hoping to get a GP appointment for something different tomorrow, so might be able to ask about it then.
I tripped on Tuesday afternoon and landed hard on my side - my left hip and hand took most of the impact. Since then, my pelvis has been very sore and I've been hobbling around, but that's easing a bit now. My hand is fine. It has been feeling like I pulled a muscle in my upper arm - tight and painful on straightening/ twisting, but nothing too bad. So I was surprised to notice this 48 hours after the accident. I actually thought it was dirt at first! It wasn't there until this afternoon, and there was no actual impact to this part of my arm. The weird straight bruise stretches from the crook of my elbow, diagonally across my arm towards my armpit. At the bottom (where the veins are), there's a small swelling about the size of a 5p.
Am hoping this is nothing to worry about imminently (am not inclined to worry, but it's so strange!).