Hmm, I'm not sure what to tell you about that, as far as what might have caused that. How long has it been like that? It almost looks like maybe cold water sat on the leaves for a long period of time, but I'm not sure. The damaged bits may turn brown and dry up, in which case you can just cut away the dead part of the leaves, but for right now, I'd just leave it and watch. If it looks like it is spreading, you may need to remove the affected parts, but I don't think you need to worry. It doesn't look like disease or anything of concern.
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