I am 13 and have some kind of open cut on me down there. I’ve had them before. Recently, they came just before I had my period. There was no itching, burning or anything. It’s like a circle and it bleeds sometimes. It doesn’t hurt unless something rubs or digs into it (like a pad) and it stings for a second then stops and I won’t notice it. What is it? Is it common? Is it an std? (I’ve never had sex before in my life)