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I think your ok, that one leaf shows discoloration on both sides of it. Mold wouldn't be on the exact same spot on both sides of the leaf. It grows on the surface not inside the leaf. Most of the time it's also fuzzy like bread mold.
I agree with the other posters. Doubt it's mold even though it looks similar. Probably a natural discoloration. Keep a close eye in case it spreads, maybe remove the affected area.