Environmental Protection Agency scientists have expressed concern regarding the possible depletion of the earth's ozone layer in the upper atmosphere. The consequence of such reduction in the stratospheric layer would increase the intensity of ultraviolet radiation, with the concomitant increase in the number of people suffering from cancers of the skin. Fortunately, most basal and squamous cell skin cancers are readily treated by physicians in their private offices and, therefore, go unreported. Malignant melanoma, however, can be highly fatal if it is not treated almost immediately, and must be treated in hospitals. This high fatality rate is indicative of the melanoma incidence and -is a more accurate index of its frequency.