Abstract: A clinical and experimental study has been done through 1974-1977 and 1979-1980.The analysis of the clinical data recovered from the investigation done in some plants and in a psychiatric hospital revealed that there are 3 variations in CPZ dermatitis; phototoxic dermatitis,photoallergic dermatitis and contact allergic dermatitis.It is of interest to note that there is one case of CPZ photoallergic contact dermatitis evolved to be a "persistent light reactor".