Red, raised bumps, accompanied by skin darkening is what ingrown hair cysts look like. These can be infected, and pus-filled, ...

Pilonidal sinus is a skin infection that causes a cyst near the buttocks, just beneath the tailbone. The infection often occurs when an ingrown hair grows internally and infects the skin.

Chae Ruffold, 15, has so far had two failed operations to repair the wound caused by a Pilonidal cyst. The wound, caused by an ingrown hair ... to not heal "It is hard. Mentally and physically ...