I have a lump on my vagina, what should i do?

A Bartholin's Cyst: It is very ikely that you have a barthoin's cyst--it is typically not an infection but can be caused by infection which blocks the gland/duct, thus collection of fluid (swelling) to cause the "bump." this can be size of a pea up size of an egg. Simple incision may do the job, but if infected, antibiotic is needed and cyst may need to be excised. Consult your doc. Good luck.

Need exam: Within the vagina (not on the outside) this might represent an inclusion cyst, your cervix, or prolapse related issues - go in for an exam and they will tell you exactly what it is!