small, brown, pimple looking bump that is on the inside of the labia minora

I'm 14 and I've noticed it about 4 days ago. It's a small, brown, pimple looking bump that is on the inside of the labia minora. I'm not sure if it's a cut or something worse. I'm not sexually active so I'm assuming it's not an std I'm just scared because I don't know what it would be. Please help. And I'm scared to tell my mom