Shizen mate.
Thrips. They're nearly impossible to rid yourself off.
If you have a plant in a pot.
Bring it outside and use a light mist spray bottle and spray most of them off.
As m0use says. Only best way to truly to rid urself of them is another preadotor that's not harmful to weed plants.
Any garden center or look up online you should be able to find some stuff..
Depending how far you're into your grow. If it's near its end 2-3 weeks. And your leafs aren't ruined
Lots of dots, they'll such the sugars from your leafs and will seriously damage your end product.