From the variety of different shapes the white markings are, you're probably dealing with thrips - but you don't need to figure out precisely what they are because there are treatments that will get rid of both thrips or spider mites. As m0use says, it's easy to find something that will help you and it really doesn't matter what that is either since you are in veg and anything can be used... but if I were you, I would choose something that can be used all the way to harvest just in case you get rid of them now and they come back later during flowering... so my recommendation to you is to get some Spinosad or Dr. Zymes Eliminator.. both are organic and both will kill thrips, spider mites, aphids, whiteflies... any sucking insect. BT is used for chewing bugs - catepillars and the like (which is NOT the problem here but I offer that just in case you ever find holes in your leaves!). Spinosad products, in particular, are going to be the most effective and easiest to find... you can get it at any garden center or online...
Good luck - it's a minor problem right now - but one that can explode overnight.