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Dermatology, medical genetics. Trichothiodystrophy ( TTD) is an autosomal recessive inherited disorder characterised by brittle hair and intellectual impairment. The word breaks down into tricho – "hair", thio – "sulphur", and dystrophy – "wasting away" or literally "bad nourishment". TTD is associated with a range of symptoms connected ...
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]
Trichophagia is a form of disordered eating in which persons with the disorder suck on, chew, swallow, or otherwise eat hair. [ 1] The term is derived from ancient Greek θρίξ, thrix ("hair") and φαγεῖν, phagein ("to eat"). [ 2] Tricho- phagy refers only to the chewing of hair, whereas tricho- phagia is ingestion of hair, but many ...
Tricho-hepato-enteric syndrome: Microscopic analysis of the hair shaft showing breaks located at nodes in the hair (trichorrhexis nodosa) and longitudinal breaks. Trichorrhexis nodosa is a defect in the hair shaft characterized by thickening or weak points (nodes) that cause the hair to break off easily. [ 2][ 3]: 636 This group of conditions ...
Dermatophytosis. Dermatophytosis, also known as tinea and ringworm, is a fungal infection of the skin [ 2] (a dermatomycosis ), that may affect skin, hair, and nails. [ 1] Typically it results in a red, itchy, scaly, circular rash. [ 1] Hair loss may occur in the area affected. [ 1] Symptoms begin four to fourteen days after exposure. [ 1]
Necrobiosis lipoidica is a rare skin ailment that often begins on the lower legs and shins. Though many of those affected have type 1 or type 2 diabetes, the rash can also occur in people without ...
Onychomadesis is a periodic idiopathic shedding of the nails beginning at the proximal end, possibly caused by the temporary arrest of the function of the nail matrix. [ 1]: 784 [ 2]: 660 One cause in children is hand, foot, and mouth disease. [ 3] This generally resolves without complication.
Beau's lines are horizontal, going across the nailline, and should not be confused with vertical ridges going from the bottom ( cuticle) of the nail out to the fingertip. These vertical lines are usually a natural consequence of aging and are harmless. [ 3][ 4] Beau's lines should also be distinguished from Muehrcke's lines of the fingernails.