a few days ago i noticed a lump inside my vagina. it didnt really hurt but now it itchs. i have had a std test a few weeks ago because i wanted to get on birth control . it all came back ok it wasnt untill a few days after i started the birth control pills that i noticed it . could it be some sort of side effect of the pill? or does it take a while to devolpe a std maybe i have one and it just didnt show up because i didnt get this lump till after i was tested. help please any addive would be great also its quite a ways in my vagina not just at the opening so i dont think its a pimple or ingrown hair its about a inch to 2 inches inside.