WHAT DO I DO

well just recently maybe on Tuesday i got this bump on the right side on my vagina. not inside or anywhere inner. its more of the outside of my vagina lip and its tender; pain like a bruise. the bump is hard like if i touch it or grab on it its just really hard. not sure how to explain it... but its pretty big not huge! not small just there and ive done research, nothing came up to match it. except some sort of cyst looking thing but idk, any ideas?