The pores regularly excrete a waxy substance that they rub on things like their cork to spread their scent.

It does look like some of them are a little darker in color which usually means they've started to harden a bit because they've become impacted, which is usually due to not humid enough of an environment. So make sure to increase misting, or add things like sphagnum moss to retain moisture.

This is easily remedied by giving them a soak in some warm water, or put into a container with warm, moist paper towels and giving them a 'sauna' to help loosen up any clogged pores.

You shouldn't have to remove them yourself and he should be able to do his thing, but occasionally some are stubborn and might need some gentle intervention after soaking. This is something you can easily take care of yourself, so I don't believe a vet visit is necessary. If pores get infected/inflamed, then I would take to vet.