Google says ‘leaf galls’ 
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So grooossss
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It's the plant responding to irritation, usually when being eaten by insects or bacteria
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Basically like the bump you get after a mosquito bite, but ours goes away after a while
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Greyscale
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Given that you are suffering from mosquitos right now. It is likely male mosquitos who drink from puncturing the leaves. The leaves then scab up like you see.
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