I had a burst vein in my finger and it got purple and had swelling. It happens. For me, it was when I was walking and my fingers swelled up (they do that somethings inexplicably) and I had my wedding ring on. I have a friend who is an orthopedic surgeon and he told me it was this. Ice it, rest your hand on a pillow above you when lounging on the couch, etc. I got better very quickly and let's see if you do as well. this article is about telling the difference between a bruise and a blood clot. You sound to be describing a bruise. REad through and see what you think. https://www.medicalnewstoday.com/articles/322829