Every month a week or two before I am meant to get my period, I get painful big boils on my face. There's no puss in them but they are still painful. The pain usually lingers for a week or two after the period is over and leaves a mark on the skin, which doesn't go away. I have never had a problem with my skin before. This has started recently from about November 2017. I went on a 2 month microgynon course but it made no difference. Please advice what needs to be done.