Cut vagina

I almost got fingered tonight, by almost I mean he tried to put it in and it hurt super bad so he had to stop, I later on realized that I had a stinging sensation and I touched it and it looked like a piece of a finger nail was down there, I tried looking but i couldn’t find anything and when I tried to spread my lips open it stung a little bit, is there anything I can put on it to heal? Like coconut oil or something?