Hi there,I noticed your message about bruising and Mirena. I have had Mirena inserted almost a year ago. Last May I noticed 3 huge bruises behind my left knee that I couldnít explain. My doctor was concerned and sent me for blood tests that didnít show any problems. I then went to see a hemotologist and the first set of tests also came out normal. Iím now booked for more specialized blood tests to make sure I donít have some rare blood disorder but I now see that Mirena can cause bruising in a small percentage of people. Iíve decided to have it removed in the next couple of weeks. Iím still going to go for the other blood testing to ensure Iím okay but since no one has been able to explain the causes of the bruising, I wouldnít be surprised if it was a side effect of Mirena.