Dictionary > Hypertrichosis

Hypertrichosis

Definition
noun, plural: hypertrichoses
An atypical hair growth in excess over the body
Supplement
Trichosis is an archaic term defined as a disease or abnormality characterized by an overgrowth of hair. The term hypertrichosis is the more widespread medical term used to refer to a condition characterized by an atypical growth of too much hair over the body. Hypertrichosis may be localized, i.e. the hair growth over a certain body part, and thus, is called localized hypertrichosis. An example is synophrys, which is a hypertrichosis in between the eyebrows. This condition gives an appearance of a single long eyebrow (or unibrow). When hypertrichosis involves the entire body the condition is referred to as generalized hypertrichosis, as in the case of werewolf syndrome (or terminal hypertrichosis).
Hypertrichosis may be congenital or later acquired in life. Congenital hypertrichosis is caused by genetic mutations. Examples of congenital hypertrichosis are as follows:

  • congenital hypertrichosis lanuginosa (a condition wherein the lanugo hair remains after birth and may not be replaced by vellus hair even at adulthood)
  • terminal hypertrichosis (a condition wherein the entire body is covered with fully pigmented terminal hair)
  • circumscribed hypertrichosis (a condition marked by the presence of thick vellus hair on upper extremities, e.g. hairy elbow syndrome)
  • nevoid hypertrichosis (congenital but may also occur later in life, a condition characterized by excessive terminal hair growing over an isolated body area)

Acquired hypertrichosis results from taking certain drugs or is associated with cancer. Examples include acquired hypertrichosis lanuginosa (characterized by lanugo hair growth especially on the face), acquired patterned hypertrichosis, and acquired localized hypertrichosis.
Word origin: hyper– (over) + trichosis, from Greek thrix (hair) –osis (condition)
See also:


You will also like...

Pollution in Freshwater Ecosystems
Pollution in Freshwater Ecosystems

There are many environmental factors that arise due to the usage of water in one way or another and for every action tha..

Schematic diagram of bacterial lactose operon
Gene Action – Operon Hypothesis

Learn how the way genes control and determine every aspect of the body. This lesson uses lac operon as an example. ..

..

Homeostatic Mechanisms and Cellular Communication
Homeostatic Mechanisms and Cellular Communication

Homeostasis is the relatively stable conditions of the internal environment that result from compensatory regulatory res..

Chemical composition of the body
Chemical Composition of the Body

The body is comprised of different elements with hydrogen, oxygen, carbon, and nitrogen as the major four. This tutorial..

IQ, Creativity and Learning
IQ, Creativity and Learning

Human intelligence provided the means to utilize abstract ideas and implement reasoning. This tutorial takes a further l..

mRNA
Protein Synthesis

Part of the genetic information is devoted to the synthesis of proteins. mRNA, a type of RNA, is produced as a transcri..

Related Articles...

No related articles found

See all Related Topics