Hi. I think I might be allergic to toilet paper. Is that possible? (I have no known allergies)

I have been using the same TP for quite some time, (plain white, unscented) but in the last two weeks I have used A LOT of it because I have used the restroom so much. Now I'm all irritated down there from front to back and it feels somewhat raw to where it stung when my pee hit it. I changed TP yesterday, but am not sure of anything yet. I used a mirror and checked myself out and even had my boyfriend inspect things because it had me so concerned. Neither of us could see anything except it's all red and irritated.

Any ideas?