Eggs are little white dots on underside of leaves. Spidermites start young as white dots moving and then turn red or two brown spots. The two-spotted-spidermites are Hella hard to get rid of. Leaf damage looks just like it. Look under leaf like said they are there.

The big question is what to do ?

Pyrithrum bombs like dr dooms will work fast and is organic.

If you have the two-spotted. The only way I can control them is with Azamax a neem oil concentrate. I think azatrol is the same. They are easier to use than neem oil. It can also be fred to plants as an antifeedant. Keeps them little bastard off my stuff.