Why does your finger swell when you bite your fingernail too low?
Answers: Your finger generally will swell or hurt if you mess next to a hang fastener - or, if you bite it to the quick, to the segment where your fastener meets fresh flesh, it is swelling because you irritated it. Try using an anti-nail biter's polish (which tastes nasty) or try getting false nail until you can break the habit.
Because you are cause it to get infected. You shouldn't be biting your nail. Let them grow. Chew something else, like mint herb or something.
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