A Spectrophotometric Study of Porphyrins in Patients with Psoriasis with Special Reference to Photosensitivity. 
Quantitative Porphyrins in blood urine and stools of 30 patients with psoriasis had been' compared with that of 10 normal controls.  Porphyrin levels have also been compared in psoriitic patients with and without history o I f photosensitivity, The erythrocyte coproporphyrin levels in patients, with photosensitivity were higher than that in patients without photosensitivity, and, this rise, was statistically significant.  However, psoriasis per se does not.  seem to affect porphyrin levels.