'Parasitic ' achromia or rather achromatic epidermomycoses (pityriasis versicolor). Decolorizing action, antipigmentary protective action of the epidermomycoses. or rather difference of resistance to pigmentation

Gougerot Joyeux Burnieb Blum, P.; Meyer. , J.; Saidmann

Since the advent of sun baths, an achromatic variant of the classical form of pityriasis versicolor has become common in France. Malassezia furfur (with which M. tropica and M. mucfadenyi are regarded as synonymous) has been isolated in all the cases examined. The absence of colour in the lesions is attributed to the action of the ultra-violet rays of the sun and of electric light. are compared in a table) in liquid nutrient media.