Two weeks ago my left thumb hurt suddenly, like I had been stung or bitten, was red and eventually turned purple like a bruise which lasted for about 24 hours. I had no issue for about 9 days and then it happened again. I went to an urgent care where the dr took an x ray and saw nothing. The bruise-like coloration faded over 3 days, however I still have a dull, achy pain and my thumb is a bit swollen. I did not injure my thumb prior to either incident. It has now been four days since the second incident.