The follicle is plugged with compact orthokeratin that protrudes above the skin surface.
Reproduced with permission from: Ioffreda MD. Inflammatory diseases of hair follicles, sweat glands, and cartilage. In: Lever's Histopathology of the Skin, 10th ed, Elder DE, Elenitsas R, Johnson B Jr, et al (Eds), Lippincott Williams & Wilkins, Philadelphia 2009. Copyright © 2009 Lippincott Williams & Wilkins.
www.lww.com.
