I've had this really painful pimple on my vaginal lip for about a week now, and it has pus. Any advice on what I should do?
It sounds like you may have a painful cyst or abscess, possibly a Bartholin's gland cyst, which can become infected and filled with pus. I recommend seeing a healthcare provider for an evaluation and potential drainage if necessary, and to avoid squeezing or irritating it further in the meantime.