Tear in labia, don't know what it's from?

Angelica

Hi ladies, so last night I woke up really itching down there so I got up, went to the bathroom, and felt around to find a cut on my inner labia. I had no idea I was even cut until right then. My boyfriend has been out of town for a week, and I don't masturbate, so I'm not really sure what it could be from. my only guess is my bike seat. Anyway, I'm not super worried, just wondering if this has happened to anyone else and if you have tips on how to get rid of the itching. Thanks!