This little gem is arguably the most painful problem of the bunch, and naturally, one of the hardest to remedy. An ingrown hair is most commonly caused by the broken end of a hair -- typically caused from shaving -- growing sideways or curling back underneath the skin. And while your first instinct may be to go fishing with tweezers, resist temptation. Grab a hot washcloth instead, which calms the irritation and brings the hair to the surface of the skin. Then, you have a yellow light to pluck away. Topical treatments like a simple salicylic acid also work wonders to help soothe and remove.