@feruze-- Exfoliation is also the best and only way to prevent ingrown hairs in the first place. Most of us have ingrown hairs because we shave or wax but forget to exfoliate the dead skin afterward. As the new hair grows, it gets caught under this dead skin and cannot make it to the surface.
Everyone who shaves, has to exfoliate their skin on a regular basis. I realize some people have sensitive skin but a washcloth will do the job too!