My hubby has really, really oily skin and is terribly prone to ingrown hairs. He gets them on his back and stomach, mostly.
He had one place on his stomach that was itching fiercely, so I looked at it and could tell it had festered. I squeezed it and pus c came out, and the hair was very curly, so I got the tweezers to pull it out. Apparently, the hair was attached to a sebaceous gland and had blocked it or something because, along with the hair, a fairly large plug of sebaceous material also came out (I know, gross. Sorry) and he yelped because it hurt. But I washed the area and put antibiotic ointment and a bandage on it and he never had any more problems with it.
Yes, it was kind of gross, but also a relief to him when that itching finally went away!