If : If you hurt your writ and had a cast on it then that means that you were taken care of by a physician. It is hard to answer you r question specifically but a good piece of advice is to contact the health care provider that took care of you. T may just be your ulna. It may be a bump of bone called callus from a healing fracture. But contact the health care provider that treated you.
Answered 10/3/2016
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