Pseudofolliculitis Barbae and Acne Keloidalis Nuchae

Pseudofolliculitis barbae (PFB) was primarily caused by close shaving, especially in individuals with tightly curled coarse hair, leading to sharp hair tips that penetrate the skin either extrafollicularly or transfollicularly. PFB commonly affected the beard area but could also occur on the pubic area, scalp, and legs. Acne keloidalis nuchae (AKN) was characterized by keloidal-like papules and plaques on the occipital scalp and posterior neck, predominantly in African American men. AKN typically began after puberty as acute folliculitis and perifolliculitis, progressing to chronic conditions with scarring alopecia.