New skin after chemical peel is sore and red. Why?

I didnt pull or tug my skin when it was peeling after a chemical peel, i let it come off naturally but the new skin underneath is still very red and sore, ive been using sun screem spf 60 and was very careful, but why is my new skin so sore and red, i can only use petroleum jelly every thing else stings. It was a 25% 14 n butyl resorcinol peel and i think there was a mixture of other stuff too. Im a skin type 4