I use a curette like this:
It's not super sharp, not like a knife, more like a tiny spoon, but enough to dig out the pus. I got mine on Amazon, this one is currently not available, but I'm sure there are other brands. It was $7 when I bought it, its a #2/4 (size of ends).

It's not super sharp, not like a knife, more like a tiny spoon, but enough to dig out the pus. I got mine on Amazon, this one is currently not available, but I'm sure there are other brands. It was $7 when I bought it, its a #2/4 (size of ends).