Girls! Hello?

Girls! Hello ? I have such a situation (photo found on the net, approximate location marked). A week ago I woke up from strong itching in this place, left closer to the groin area. Itching was like outside, not inside!!! Yesterday also the same and today!!! It passes quickly as soon as I turn my back! I sleep always on the left side!!! Maybe I'm pressing on veins or what could it be, tell me ?