How should I manage nose sebum in elementary school students?

I have an elementary school child.

Blackheads started appearing bumpily on my nose a few months ago, and now the sebum has hardened, as if they have settled in permanently.

At first, I didn't realize they were blackheads; I just assumed they were pimples that would go away, but they aren't disappearing.

I try to squeeze it out, but it won't come out, and every time I try, my child says it hurts and tells me to just leave it alone, so I'm just neglecting it.

If it were adult blackheads, I would probably use cosmetics or get treatments...

It's elementary school student's skin, so I don't know how to take care of it.

I've been searching so much that ads keep popping up on Instagram, and I'm not even sure if it's effective...

The blackheads have hardened and look like pimples, so as a mom, I'm quite worried and want to get rid of them. What should I do?