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Hi thanks for getting in touch, could you tell me a little more about what you'd like to discuss? Thanks
Are you able to attach a picture?
Usually the best thing to do would be to apply ice twice a day for at least 20 minutes each in helping to reduce the bruising. I do wonder if there was a slight trauma to have caused a small vessel to rupture. It will be self contained however but using ice and giving it time will help. Also when you sleep at night you should rest that hand on a pillow so that it's elevated a bit this also helps to reduce the swellling.
It often doesn't have to be a major trauma at all, even picking something up wrong or at an odd angle can do it but really it will get better on it's own and more so with the ice and elevation. I hope you feel better soon, all the very best.