Help! Strange bump on inner thigh

Jennifer

I've had this bump for about a week. It started out smaller, and has grown to this size. It doesn't look big, but when I squeeze the skin around it, it's about the size of a grape. I've tried popping it, but there's no head, and it's super tender. It hurts rubbing up against my clothes, and when it brushes against my other thigh. I haven't done much for it other than putting a warm wash cloth on it. Any idea what it might be?!