What is dermatographia? what causes dermatographia and how do you treat it?

Dermatographia is a condition also known as skin writing. people who have dermatographia lightly scratch their skin, the scratches redden into a hive- ish scratches raised above skin level. Although many people with the condition don’t seek treatment some are antihistamine medications such as Benadryl, Allegra or Zyrtec