HAIR
Description:
Part of the skin that helps to protect the body from UV rays and insulates the body. A single strand of hair contains the follicle, root, and shaft. The follicle originates in the dermis with the hair root, and as it protrudes out the skin, the visible part is known as the hair shaft. From the outside in, the three layers of hair are the cuticle (made of keratinocytes), cortex, and sometimes the medulla. Hair is located everywhere on the skin except the palms, the bottom of our feet, lips, and certain reproductive parts.
Diseases and Conditions
Androgenetic alopecia
Genetic condition that causes thicker, terminal hairs, to become less visible vellus hairs. It leads to a receding hairline and is more common among men than women.
Alopecia Areata
Autoimmune condition leading to the loss of hair, which can lead to baldness in the scalp and patchy areas of hair.
Pediculosis Capitis
Also known as head lice, a louse insect may lay its nits, or eggs, on the hair shaft on the scalp, and as they develop, they lead to an itchy scalp.
Folliculitis
Inflammation of the follicles due to irritation from friction, injuries, or bacteria.