Мы тестируем новую версию сайта. Эта версия обновляться не будет. Приносим извинения за временные неудобства.
We are testing a new version of the site. This version will not be updated. We apologise for any temporary inconvenience.
Estamos probando una nueva versión del sitio. Esta versión no se actualizará. Rogamos disculpen las molestias.

Site statistics

35225 facts from 177 countries related to 1198 phenomena have been registered in Archive. 2834 of them were solved, another 11033 are under verification for compliance with one of the 322 versions.

0 facts have been added for last 24 hours.

Share your story

You are in "Versions" section

This section includes information about possible versions explaining the true nature of the event described in the fact.

Dermographism

Dermografism (from other-Greek. δέρμα-skin, γράφω-I write) is a physiological phenomenon that consists in changing the color of the skin in the place of light irritation. It is caused by running a blunt object over sensitive skin. Dermographism is after about 30-40 minutes.

With minor skin irritation as a result of the vegetative vascular reflex, the skin color changes from bodily to paler or more reddish (hyperemia).

Types of dermography[edit / edit code]

  • White (Latin: dermographismus albus) - is caused in almost all people, especially easily in feverish conditions in asthenic subjects. It is formed, due to angiospasm (narrowing of the lumen of blood vessels), in the form of white stripes on the skin, protruding 1-2 mm on both sides of the irritation site 10-20 seconds after light exposure. Lasts 2-3 minutes.
  • Red (Latin: dermographismus ruber) - is a common phenomenon, and its absence indicates a weak vasomotor reaction. It is formed with a stronger impact after about 15 seconds in the form of streaks of hyperemia (redness). Sometimes they are surrounded by white angiospastic stripes. It lasts about an hour.
  • Edematous (Latin: dermographismus oedematosus) - a relatively rare phenomenon, which is an individual skin reaction in the form of an edematous roller 1-2 mm high and 5-15 mm wide. It forms slowly, sometimes after several tens of minutes. It lasts for a long time and just as slowly disappears.

Not to be confused with hereditary dermographism - a skin disease and one of the most common types of urticaria.


Log in or register to post comments

Site friends

  • Мир тайн — сайт о таинственном
  • Activite-Paranormale
  • UFOlats
  • Новый Бестиарий
  • The Field Reports
  • UFO Meldpunt Nederland
  • GRUPO DE ESTUDOS DE UFOLOGIA CIENTÍFICA
  • Паранормальная наука, наука об аномалиях
  • Новости уфологии
  • UFO Insights
  • Mundo Ovnis

Attention!

18+

Site contains materials that are not recommended for impressionable people.

You are reporting a typo in the following text:
Simply click the "Send typo report" button to complete the report. You can also include a comment.