In a man or woman with dermographia, certain epidermis cells known as mast cells have a tendency to be overly sensitive once they experience minor trauma, such as that experienced when a person scratches his or her skin. When a person with dermographia scratches his or her epidermis, it brings about the mast cells to release unique chemicals known as histamines. When histamines are released ın a very human being with dermographia, the little blood vessels dilate. As the blood vessels dilate, or widen, it causes the characteristic redness and itching related with dermographia.
In short- when pressure is applied to my skin it creates welts.. thus I am able to write or draw on my body. Here my husband used a pencil.
Photos by Mikel Allen