Hello,
It can be due to folliculitis, cyst or genital wart(caused by HPV infection).
Apply warm compresses,Neosporin ointment and calamine lotion and avoid messing with it. You can take anti-inflammatory pain killers like ibuprofen or acetaminophen. If the lumps persists then it will be best to get it evaluated from a dermatologist.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
How could he see it? Are you saying it is right near the entrance?
Try not to be scared, just make an appointment with your ob-gyn.