Also known as skin writing, dermatographia is a kind of hives caused by the patient when scratching certain areas of the skin, causing linear welts that follow the pattern marked by the direction of the fingers and nails when pressing the skin.
These are temporary lesions that can appear immediately after the physical stimulus (it is the most common, affecting about 6% of the population) or they may appear 20 or 30 minutes after the stimulus, classified as delayed dermatographia.
Although all people that vigorously scratch their skin show some redness and inflammation in the area, patients with dermatographia have an exaggerated reaction, producing a series of symptoms of greater or lesser intensity depending on the case.
In this condition, the chemical released into the skin is histamine, an agent that appears in allergic reactions, although it has not been conclusively determined that it is due to allergic issues. Emotional factors have also been identified as possible triggers of dermatographia.
It is more frequent in adolescents and young people, although people of any age are susceptible to it, being able to remain active for years.
Several months of treatments with antihistamines are recommended, in addition to avoiding high temperatures, wearing tight clothing, rubbing too much when bathing, and drying too hard.