All you Phal lovers, check this out and maybe help identify the problem. Just noticed it yesterday. Was not there when I watered on tues. Is kept in a south window, but there is no sun due to the fact that there is an overhang. Just bright light. All the other phals are ok so far. No sign of any insects. Whatever it is, does not go thru to the underside of the leaf and the leaves are firm not mushy. Thanks for any help you can give.

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