I have had problems with spotting for the past 6 months. I have had many tests done and my gyno has only just found out the cause which is a low grade cervical infection (caused by my mirena which I have had taken out) in conjunction with an erosion of the cervix. An erosion of the cervix is not a serious condition but it can cause mid cycle bleeding. I am having a minor operation to remove the cervical erosion in July.