Hardware Strange lights showing through the plastic?

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i bought this o3ds from a japanese website a week ago and today i just noticed these strange light bleedings

i tried looking it up online but found almost no information about it, i had another o3ds since 2013 but this never happened to it

i really don’t mind them as irl you can’t really perceive them unless you’re playing in the dark; but will this bleeding become worse? has anyone gone through this?

 

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adding this comparison between the two consoles mentioned above.