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There is this kind of substance in pineapple that may cause itchy to the tongue and lips. That is why it is suggested to peel up until you can not see any black part in it. Ant to neutralize the substance, it is also recomended to wash the pineapple in a salty water (you can have a little of water, then add a spoonful of salt, then wash the pineapple in it. twala......
I would guess that it would be because of the acids that it contains, or those little pointy things that it has, that sometimes don't complitly come off when you peel them.
I mean a liter (1000cc) lol not that salty