From my research - this does not look like zoa pox, but rather a frag that is still acclimating. The striations you see are normal. The small specks may be debris - they could probably be removed with some slight turkey basting.
Zoa pox are more reminiscent of a pustule. Think of a pimple that is ready to burst (sorry!). They are typically in groups as well so it's colonized rather than one offs.
Did you dip this frag before introducing it in your tank? If so, give this one some more time before taking any actions.