Ariana Page Russell, 34, based in Brooklyn, New York, has dermatographia; which means when she rubs or scratches herself a red, swollen imprint is left on the spot.
In a bid to combat stigma, she started photographing the marks on her body - to date her images have been exhibited at galleries across the U.S.
She uses a blunt knitting needle to write text or create abstract patterns on her stomach, arms, legs and face. The designs, which are pain-free, last for about 30 minutes before fading.