What Causes Protrusion Of Extra Skin Tissue Through The Vagina?

hi, i got infection in my vagina .... at first place few weeks back i found to small pimples and i just ignore that but now it increase to extra skin come out and hanging around my vagina and i feel so itchi nd feel uncomfortable... i been to doctor he gave me antibiotics as he said if it not recover in 5 days neeed to do operation... is that serious matter ???? please guide me what is this infection