Fox mange, a disease in which the hair falls out: Alopecia can be explained as the absence of the hair from skin areas where it normally is present, especially of the head.

Alopecia is one characteristic of mange. It affects both men and women of all ages.

Mange is defined as a contagious scabies-like dermatitis occurring in various animals, including cattle, sheep, horses, dogs, cats, foxes, rabbits, rats, and gallinaceous birds (domestic fowls); caused by any of several of the mange mites.

Loss of hair in sharply defined patches usually involving the scalp or beard: Alopecia areata can be a patch baldness that typically begins with rapid hair loss on certain areas of the scalp and sometimes it progresses to complete baldness and even loss of body hair.

Alopecia areata affects both males and females and, most often, children and young adults. It seems to be caused by the body's own immune system which attacks the hair follicles and disrupts normal hair formation.

The hair can sometimes regrow within a year without treatment, however the longer the period of hair loss, the less chance that it will regrow.

Translation: "Complete absence of hair from the scalp or the loss of all scalp hair; with normal hair elsewhere on the body remaining."

Baldness due to absence of hair bulbs at birth: Mary and her husband were very surprised when they noticed that their baby didn't have any hair on its head, and learned from their doctor that little Jenny had a case of alopecia congenitalis which sometimes occurred in newborn babies.

Baldness due to inflammation of the hair follicles of the scalp: Alopecia follicularis, a skin disorder, is a rare form of alopecia, and can occur in both adults and children.

Loss of hair along the hairline, both front and back, of the scalp: Nancy was concerned about her hair falling out and consulted a doctor who said that she had a case of alopecia liminaris which was caused by pulling her hair back very tightly into a pony tail.

Loss of hair due to the administration of certain medicines: In her book on dermatology, Elaine read about alopecia medicamentosa which was caused by chemotherapy and especially by agents containing cytotoxins.

Loss of both scalp and body hair accompanied by desquamation of branl-ike scales: Alopecia pityroides often occurs together with dandruff and an overproduction of sebum and saccharomyces albicans.

Premature baldness: Alopecia prematura was what Jim read about in the article and explained why he was getting bald so early in life and which was due to a parental disposition

Loss of hair after prolonged fevers or during the course of a disease: Alopecia symptomatica may result from systemic or from psychogenic factors.

Loss of hair thought to be due to toxins of an infectious disease: Alopecia toxica can occur 4 to 12 weeks after being infected with a serious illness with fever, influenza, or COVID 19.

Loss of hair from the entire body: Aopecia universalis is considered to be the most severe kind of alopecia areata and includes the loss of all body hair, like on the head, eyebrows, eyelashes, armpit hair, chest hair, and pubic hair.

Typical hair loss pattern of men: The male pattern alopeciabegins in the frontal area and proceeds until only a horseshoe area of hair remains in the back and temples.

This loss is dependent on the presence of the androgenic hormone testosterone.

Hair loss caused by injury to the scalp: Common causes of traumatic alopecia include the use of caustic hair straighteners, especially those that include lye as an ingredient, stress traction injury from tight rollers and braiding, over heating of the hair shafts; and the compulsive pulling out of hair (trichotillomania).