What Causes Burning Sensation In Vaginal Area?

hi i am really worried about my genitals, i had my period on the 25 and it was really heavy i used both tampons and pads now my perios is over but the skin arround my vagina feels and looks like chicken skin, i also get a really mild sting feeling sometimes and yesturday it was burning when i pee (outside vagina) right below vagina opening what can it be? i am 22 and sexually active. thanks