Abstract
Statistical surveys of the incidence of different diseases of the skin are influenced to a great extent by the age, the race and the social level of the subjects studied, as well as by the diagnostic interpretation of the examining physician. The seasonal variations which are noted in many diseases affect studies made within a short period. Further discrepancies occur when the cases recorded have been observed independently by two or more physicians. Such diversification is made evident by a comparison of the lists of the most common cutaneous conditions prepared by Lane, 1 by Goodman, 2 by Gilman 3 and by Alderson and Reich. 4 There are differences not only in the ten diseases composing the several lists but in their relative positions. Four diseases, dermatitis, pyoderma (including impetigo), acne vulgaris and tinea, appear in all four compilations. Eczema, urticaria, herpes (zoster and simplex), verrucae and seborrhea are
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