The first time, it was a newly growing hair. After you "plucked" it, became ingrown. The easiest way to solve this is to carefully use tweezers to pull the hair out from below the surface of the skin, but do not "pluck" or pull the hair completely out or it will just become ingrown again. After doing this, allow it to heal, and it should be as good as new!
The more times is becomes ingrown, the harder it is to get out, the more it bleeds, and the worse it gets; even becoming infected.