An ingrown hair is caused when the tip of a hair is made sharp by cutting it. Then if the sharp end gets below the skin and it doesn't grow straight back out the sharp end can push its way in to and under the skin causing iritation. Plucking (Ouch) and waxing (double Ouch) pull the hair out and don't cut it, since there is no sharp end the har is forced to grow out the path of least resistance.
As Averett said if you get one you just have to "dig it out", then if you pluck it, it should grow back normal.
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