[Left] photo is Monsignor Andrea Gemma showing hemography. [Top right] image is hemography of Sister Maria Teresa Pinol.[Right] image is hemography given to Giulio Massa.
Following excerpt from [here]. Hemography is the process whereby blood from the [stigmata] or bloody sweat is miraculously formed into christian writing, images, and symbols upon hankerchiefs, bandages etc., presumably through Divine intervention.