The structural, or pilosebaceous, unit of a hair follicle consists of the hair follicle itself with an attached sebaceous gland and arrector pili muscle. The hair follicle begins at the surface of the epidermis. For follicles that produce terminal hairs, the hair follicle extends into the deep d...

Hair follicles and their keratinized product, hair, are skin appendages present on nearly every part of the body. Areas of the body typically devoid of hair include the palmar and plantar surfaces, lips, and urogenital orifices. Sex hormones influence the distribution, texture, and color of hair. Ha...

The infundibulum is the funnel-shaped, uppermost epithelial segment of the hair follicle. Thus, as the infundibulum represents a major interface zone of mammalian skin epithelium with the environment and harbors a rich residential microflora, it is not surprising that this area is endowed with a spe...