Swollen and Slightly painful Clitoris???

So about two days ago I had a pain that kind of felt like a pimple almost it didn’t hurt too bad. It was really only when I touched it, but now it’s like one side of it is swollen and slightly red and is really only uncomfortable if I sit a certain way. I have a gynecologist appointment the 2nd Of August to get my IUD stings clipped. Do you have any ideas as what could be happening or what is causing it to do this. Please, I’m really worried!