1. A method for discriminating between benign and malignant skin lesions, the method comprising the steps of: generating a plurality of spectral reflectance images of a skin lesion using an optical transfer diagnosis (OTD) device; creating, for each of a plurality of parameters, a spatial distribution map of the skin lesion from the plurality of spectral reflectance images; determining entropy values for each of the spatial distribution maps; determining cross entropy values between pairs of the spatial distribution maps; determining, from the plurality of spectral reflectance images, a plurality of morphology parameter values; calculating, for each of the determined values, a logarithm of that determined value; for each of a plurality of weight values, applying that weight value to a corresponding one of the determined values and calculated values to produce a diagnostic index value; comparing the diagnostic index value to a threshold value to indicate if the skin lesion is a malignant skin lesion.