They are very tiny cousins to spiders, so small they look like little white or red dots on the bottom of the leaves. Your eyes would need to be a lot better than mine to see their legs, lol. They suck the juice out of the leaf, weakening the plant. You can tell you have them because the leaves looking blotchy and pale, and you may see some cobwebbing.What are spider mites? I don't want to look it up myself because I'm afraid of spiders and don't want to see photos. But spider mites are just mites right?