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Sam Cooper ADMIN August 6, 2009
Everybody welcome! We're new, for now, but I hope we can grow much larger. I know there aren't many of us, but I hope we can find everybody who has taken pictures of, or has the disorder.

Anyone is welcome to join, but only pictures of a dermatograph will be accepted in the pool.

And PLEASE, if you have the opportunity to photograph another dermatograph, do so. I have a feeling that this group will never involve a large population, so any photographs are appreciated.

Group Description

Photos of or involving dermatographic urticaria. Welts on skin caused by the disorder. Yes, the disorder occurs anywhere there is skin, but let's keep the pictures appropriate. Anything deemed inappropriate to the subject matter, or in general will be removed.

Skin writers, unite!

DU is a severely lesser-known, and extremely under-investigated disorder. I hope that with the formation and support of this group we can discover and better understand all of the ups and downs of dermatographic urticaria.

From Wikipedia:
Dermatographic urticaria (also known as dermographism, dermatographism or "skin writing") is a skin disorder seen in 1.5 to 23.5 percent of the population[1], in which the skin becomes raised and inflamed when stroked or rubbed with a dull object[2]. Dermatographic urticaria is caused by mast cells in the surface of the skin releasing histamines without the presence of antigens, due to the presence of a weak membrane surrounding the mast cells. The histamines released cause the skin to swell in the affected areas.

This weak membrane easily and rapidly breaks down under physical pressure causing an allergic-like reaction, generally a red welt to appear on the skin. It can often be confused with an allergic reaction to the object causing a scratch, when in fact it is the act of being scratched that causes a welt to appear. These welts are a subset of hives that appear within minutes, accompanied by a sensation of burning, and/or itchiness. The first outbreak of hives can lead to others on body parts not directly stimulated, scraped or scratched. The redness and swelling stays from anywhere upwards of 10 minutes. Often this leads to difficulty sleeping, irritability, and general discomfort.

It can be treated by antihistamines or cromoglicate, as they prevent the histamine from causing the reaction. The underlying cause of dermographism is not known, and can last for many years without relief. 95% of chronic cases are never solved. Sometimes the condition goes away, sometimes it stays forever. It is not a life threatening disease.

Additional Info

  • Accepted content types: Photos, Videos, Images, Art, Screenshots
  • Accepted safety levels: Safe
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