You probably have a little cut inside . I had a little cut w my first on the inside of the lip and it would burn like hell. This time I didn’t tear or had any cuts and I was fine right away to use the bathroom , Didn’t feel any burning like I did the first time .
I just got the burning to stop a couple days ago & I delivered 3 weeks ago! If you lean all the way down while you are on the toilet and like look at the ground that somewhat helped me.