MY granddaughter is 15 and has had the contreception rod placed in her arm about 3 months ago, since she has had ongoing  bleeding , today she has come out in grey to light brown circles on her back, a bit like the marks on my face when I was pregnant. I took her to our local Hospital and they have not seen anything like it before. Could it be a hormone reaction to the Rod
Looks like hormone problem. Get one abdominopelvic scan. Get the rod removed. Take plenty of fluids, take fruits containing vitamin C