Though the etiological conditions for leprosy have not been clearly understood yet, the study gives the whole spectrum of approach for future researchers, so as to focus their emphasis on correlating this disease with the trace elements of soils. Such studies should be encouraged as it provides the key to the control of leprosy. But at present, the regional concentration of leprosy is less marked and large numbers of cases go unnoticed in the central plains of Bengal, especially around the Calcutta Metropolitan district. If such cases are not isolated and treated there is an immense probability that leprosy in West Bengal will be a much greater menace to society than it is today.