SUMMARY In a Study of thirty‐four male subjects suffering from the syndrome of chronic photosensitivity dermatitis and actinic reticuloid the clinical, histological and photobiological features were such as to suggest that they were in fact examples of a single entity in which the degree of response to ultraviolet and visible light varied. Although a wide action spectrum involving UV and visible wavelengths invariably occurred with the classical clinical and histological features of actinic reticuloid (Ive et al., 1969) a broad action spectrum with similar histological appearances was also noted in some of the subjects in whom the morphological changes were those of a chronic dermatitis confined to exposed sites.

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