[Etiology of perioral dermatitis].

The studies of Röckl und Schubert supported the theory that fusobacteria are often found in perioral dermatitis. When we characterize perioral dermatitis as fusobacteriosis, we do not have any doubt that fluorinated corticosteroids represent a very important pathogenetic factor. Corticoids enable opportune fusobacteria to become pathogenic. In our opinion without these bacteria the beginning of the perioral dermatitis seems impossible. Other supporting causes, which are relevant to sex distribution (oral contraceptives, moisturizing creams) are described.