Looks more like a wall to new pus...
Get an x-acto knife:
https://www.amazon.com/X-ACTO-2-Knif.../dp/B000V1QV7O
You can find at any art supply or hardware store. The tip of that blade is insanely sharp. Take the blade out of the handle - you won't be using it - and sterilize it with some alcohol. Then hold the blade between your thumb and forefinger so just the very tip of the blade - about 1/8" - extends from your fingers. All you have to do is touch this white "thing" with the tip of the blade and it will be pierced, but your fingers will keep it from going in too far and hurting him, even if he moves. It is so sharp he likely won't feel it. You will know soon enough if it is pus.