Why does the skin under your fingernail turn white if آپ press on your fingernail?

I've always wondered this...
 Chaann94 posted پہلے زیادہ سے سال ایک
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Darkshine said:
The pressure makes your blood stop flowing for a moment on that spot, I think.
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posted پہلے زیادہ سے سال ایک 
Sasume said:
Yeah I think the pressure pushes the blood out of the spot...
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posted پہلے زیادہ سے سال ایک 
rapunzeleah123 said:
Yeah they're both right
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posted پہلے زیادہ سے سال ایک 
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