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Premature greying of hair (PGH), also known as canities, is the process of greying of hair occurring at an unusually early age. It can have negative effects on self-confidence, self-esteem, and social acceptance of the affected individual. Hair is said to have greyed prematurely if it occurs before the age of 20 years in Europeans, before 25 ...
Poliosis. Poliosis circumscripta, commonly referred to as a "white forelock," is a condition characterized by localized patches of white hair due to a reduction or absence of melanin in hair follicles. Although traditionally associated with the scalp, poliosis can affect any hairy area on the body, including eyebrows, eyelashes, and beards.
Changes in hair colour typically occur naturally as people age, eventually turning the hair grey and then white. This normally begins in the early to mid-twenties in men and late twenties in women. More than 60 percent of Americans have some grey hair by age 40. The age at which greying begins seems almost entirely due to genetics.
Waardenburg syndrome is a group of rare genetic conditions characterised by at least some degree of congenital hearing loss and pigmentation deficiencies, which can include bright blue eyes (or one blue eye and one brown eye), a white forelock or patches of light skin. These basic features constitute type 2 of the condition; in type 1, there is ...
Alopecia areata, also known as spot baldness, is a condition in which hair is lost from some or all areas of the body. [12][1] It often results in a few bald spots on the scalp, each about the size of a coin. [7] Psychological stress and illness are possible factors in bringing on alopecia areata in individuals at risk, but in most cases there ...
Keratosis pilaris. Keratosis pilaris (KP; also follicular keratosis, lichen pilaris, or colloquially chicken skin[1]) is a common, autosomal - dominant, genetic condition of the skin's hair follicles characterized by the appearance of possibly itchy, small, gooseflesh -like bumps, with varying degrees of reddening or inflammation. [2]
Uncombable hair syndrome (UHS) is a rare structural anomaly of the hair with a variable degree of effect. It is characterized by hair that is silvery, dry, frizzy, wiry, and impossible to comb. [4] It was first reported in the early 20th century. [5] It typically becomes apparent between the ages of 3 months and 12 years. [6]
Hyperpigmentation can be diffuse or focal, affecting such areas as the face and the back of the hands. Melanin is produced by melanocytes at the lower layer of the epidermis. Melanin is a class of pigment responsible for producing color in the body in places such as the eyes, skin, and hair. The process of melanin synthesis (melanogenesis ...