I can't tell what the spots are without seeing them. If it is only on the surface it could be sunburn or mealybugs (raised areas). If it's on both sides of the leaves it might be a sign of insect damage but the insect is long gone. You can simply pull off the spotted leaves; new leaves will be produced. I don't think the spots will hurt you if you eat the spotted leaves. Rinse them off first, though, just in case there's an insect!
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