Dermatographia

Dermatographia is a rare skin disorder in which the skin is extremely sensitive to touch. Following the slightest abrasion, the skin swells into raised, red welts that are sometimes itchy. Although it is unknown what causes this condition, it is thought to be an allergic reaction, lacking in the appropriate antigen.

This skin disorder can be an artist’s unique medium, as is the case for Ariana Russell, who showcases this disorder in her artwork: