whileyouwereout:

typefiend:

Ariana Page Russell, for example, uses her skin as a canvas. Afflicted with the rare disorder dermatographia, any scratch or pressure on her skin results in a raised red welt lasting about thirty minutes. She documents the resulting “tattoos” as a series of photographs

I always wanted to do this with my psoriasis. 
Selectively cover it and than hit it with uv.
Never got around to it though.

Intense! Both!