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The middle of the screen area has bright froth like lighting. Back light only has this problemz No other issues. The spread is increasing. Now it has covered 80 % of area. I stay in humid area. Since I travel a lot , I place it on table or shelf sometimes covered in leather bag and use it sparingly. Not fallen down or accidents. Will the screen absorb moisture from environment? No screen protector used. Photo attached. Pl help.

Screen image in 2019 march .to support my qn above.

the ipad screen image is showing like this , 4 months before posting of this question. See how much spread has been increased in the 4 months. I have not used it for these 4 months. Kept sealed on a bag. I have used very sparingly. Any solution instead of going to the shop?