What if I didn't use neutraliser after applying 20% glycolic acid?

yesterday i applied a 20% glycolic acid on my face and neck. As per the instructions i even made a baking soda and water sol.but after 4-5 min. Of peeling, when i applied the the baking soda and water sol., It gave a stinging burn so i stopped applying it and immediately washed off the peel with just plain water. Now, today i feel a stretching on my face & neck & even my face colour has became a little dark(probably 1level dark) So i wanna ask is this a burn becouse of not applying neutraliser?