Pimple on vagina?

I felt a bump on the right, outside part, of my vagina and it’s sore like a pimple that stays under the skin if that makes sense. I don’t see anything there but i don’t know what it could be

Update: TMI I popped it and a lot of green thick (I assume) pus came out of it. I guess it must have been a pimple? I’ve never had discharge from acne like that before