The Naked Scientists

The Naked Scientists Forum

Author Topic: Dermographism---- What causes this unusual skin condition ?  (Read 7161 times)

Offline neilep

  • Withdrawnmist
  • Naked Science Forum GOD!
  • *******
  • Posts: 20602
  • Thanked: 8 times
    • View Profile
Dear Skinologists,

There's this condition called Dermographism......It causes the skin to elevate when under pressure.

see this piccy ?




Is this a dangerous condition ?......and what is process that makes this happen ?




 

Offline Karen W.

  • Moderator
  • Naked Science Forum GOD!
  • *****
  • Posts: 31653
  • Thanked: 5 times
  • "come fly with me"
    • View Profile
Dermographism---- What causes this unusual skin condition ?
« Reply #1 on: 22/11/2007 16:07:26 »
It was a dangerous condition in "THe Exercist" Yikes!!! Scared the soup out of me!!! I had no Idea it was a real condition!
« Last Edit: 22/11/2007 16:15:54 by Karen W. »
 

Offline RD

  • Neilep Level Member
  • ******
  • Posts: 8128
  • Thanked: 53 times
    • View Profile
Dermographism---- What causes this unusual skin condition ?
« Reply #2 on: 22/11/2007 18:05:36 »
Dermographia is associated with allergic conditions which can either be caused by exogenous allergens, (drugs, foods, pets, etc) , or endogenous allergy, a.k.a. autoimmunity.
Extreme allergy (anaphylaxis) can be fatal if the airway is obstructed by edema.
« Last Edit: 22/11/2007 18:10:44 by RD »
 

Offline Andrew K Fletcher

  • Neilep Level Member
  • ******
  • Posts: 2331
  • KIS Keep It Simple
    • View Profile
Dermographism---- What causes this unusual skin condition ?
« Reply #3 on: 22/11/2007 20:09:46 »
urticara nettle rash mozzi bites and cane marks from school might fit the bill?
 

Offline RD

  • Neilep Level Member
  • ******
  • Posts: 8128
  • Thanked: 53 times
    • View Profile
Dermographism---- What causes this unusual skin condition ?
« Reply #4 on: 23/11/2007 16:36:03 »
... cane marks from school might fit the bill?

Very little pressure is required, ("six of the best" is not necessary to produce this effect).

Quote
Some people have skins so sensitive that it is possible to write on them with a fingernail or the smoothly curved end of a paper clip. This extreme sensitivity, called dermographia ("writing on the skin") is the usual explanation when patients complain that they are "allergic to everything," two Little Rock physicians reported in the A.M.A. Journal. Although the condition has been known for years, it is often overlooked and causes a lot of needless doctoring.

Patients of this type, say Allergists Thomas G. Johnston and Alan G. Cazort, react simply to pressure on the skin. When the allergist applies a patch containing a suspected cause of allergic reaction, the patient reacts all rightóbut to the pressure of the patch, not to the supposedly allergenic substance. In their practice the doctors found that many patients who say they are allergic to wool are actually irritated by the wool's rough fibers: properly conducted patch tests show that they do not react to pure wool, or the wool in their particular sweaters. For girls, wearing a cotton blouse under the wool sweater usually solves the problem.

In children, the skin frequently shows wheals if stroked repeatedly in the same spot, but this sensitivity usually wears off. Among adults, dermographia may occur in either sex and show up as redness and swelling around the belt or girdle line, or under shoulder straps or suspenders. Antihistamines are generally effective in controlling the reaction, say the Little Rock doctors.

There is a simple way to weed out patients who are "allergic to everything": apply two patches with equal pressure, one patch containing suspected allergen and the other inert. If the reaction is the same, the patient has dermographia.
http://www.time.com/time/magazine/article/0,9171,868983,00.html
« Last Edit: 23/11/2007 16:41:41 by RD »
 

The Naked Scientists Forum

Dermographism---- What causes this unusual skin condition ?
« Reply #4 on: 23/11/2007 16:36:03 »

 

SMF 2.0.10 | SMF © 2015, Simple Machines
SMFAds for Free Forums
 
Login
Login with username, password and session length