“…But an indictment is not firm unless a straightforward dermatitis medicamentosa is observed-urticaria, rubelliform eruption, erythema multiforme and nodosa, multiform erythema, vasculitis and purpura, or photosensitization. The discovery of a developing or accentuated dermatographism would favor drug sensitivity (7). Elimination of all, or at least the most likely causative medication, can be tried: arsenic, phenolphthalein, antipyrene, phenobarbital, cocaine, morphine, quinine, sulfanilamide, penicillin, chloroquin, chlorthiazide and mercurials.…”