First of all, I agree with the other answer, which suggests slowing the print and increasing the temperature (upvoted). I also see some evidence of de-lamination between layers in the photo, which lends weight to that idea.
But I want to address this:
I assume those pores are dragged by the nozzle when it moves inwards to print the infill.
Perhaps. There's also a chance these gaps are the result of the nozzle as you suggest...
... however, if that's true, it's almost certainly not the nozzle itself. For the nozzle to cause this problem, the z-axis would actually have to descend as the layer tries to adjust upwards.
Instead, I'd look for a clump of material stuck to the nozzle edge, either during a priming phase in the machine beginning g-code or picked up from the first layer where an early part of a brim/raft/skirt may not have completely stuck to the print bed.
This happens commonly with my printer now that the nozzle has aged some, and I tend to watch the printer carefully while it warms up for a new print so I can remove the priming material with a putty knife before it can cause a problem.