Those actually look more like thrips.(The white ones), They do the same thing. Spider mites, thrips and scale are all sap suckers and will feed off a plant in the same manner. Thrips can be easier to get rid if than mites, because mites are actually arachnid-like and some things do not work on them. Once a mature scale forms its shell it can also be hard to get rid of them. Don;t stop with just one treatment. You should take the entire plant outside and spray every nook and cranny, every leaf surface adaxial and abaxial, and the trunk to dripping, at least 3 applications a week apart to get new hatchlings
