I need help identifying this 😩

Help Help Help. I don't know what this is, I've never experienced it before. I just got off of my period, and it started towards the end? I used pads, tampons don't work well for me. Is it from the pad irritating me? Maybe even my underwear? It stings, and it hurts constantly. I don't know what it could be. It's on both sides too.Â