mite infestation has a whitish weblike stuff under the leaf(or the underside of the leaf seems to be perspiring)....your picture looks like its a fungi infestation (dark center with a yellow ring around it) or some water mark damage....
just for your peace of mind:
a cheap home remedy
12 drops dish soap
1/2 teaspoon cinnamon extract=the one found on the supermarket aisle with the vanilla and almond extract for baking
2 cups tepid water
mix this in a spray bottle and drench the whole plant
make some more and soak the pot for 5 min to kill the insect eggs
repeat after a week....two weeks rest then repeat again for 2 weeks interval
*this is not harmful to humans or pets = it also serves as a watering method
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