After popping a pimple in your nostral, why is it still sore ?

Nostril: The nose is a very sensitive place, as you've discovered. You can consider a pimple a simple infection and when you pop it, the infection isn't magically completely gone. Much of the pus is. Also, when you pop a pimple, there is now an open wound and nerve endings that are exposed to the air/outside world. These are the reasons your nose still hurts. It will get better...Just takes time.