It isn't an issue, I have 1.1 baby pieds who get red before they shed and for a couple days later. I am sure all snakes get some irritation it just shows up better on the white on a piebald.
even my 1600 gram pied female gets irritated scales sometimes when she is messing around going in and out of her hide.
I have seen it multiple times in all 3 of my pieds, no reason for concern. if you notice it in 2 or 3 days then id start to raise concern with your substrate and what not.
as of what im seing in your photo I personally would not be concerned.