Fungal Skin infection?? Help :(

I have a large path of dried skin right next to my vagina in my inner thigh. It is red with a pale centre and it has grown in size, so I assume it is a fungus.

Any suggestions on how to treat it? Last time I had one it was in my back and I treated it with apple cider vinegar, but now I am afraid the acidity will mess up down there.