[The effect of endogenous and exogenous factors on psoriasis vulgaris. A clinical study]

Using computerized data collected from 390 patients we investigated the impact of "endogeneous" factors (infections, menarche, menopause, gravidity, hormonal contraception, stress, nutrition, alcohol consumption, drugs) and "exogenous" factors (seasons, climate, sun exposition, Koebner phenomenon) on the course of psoriasis. We recommend certain rules of behaviour based up on our data and the reviewed literature. It is of importance to inform patients about their skin disease and positive as well as negative modifications of its course by endo- und exogenous factors. This is the only way to enable patients for an active selfcare.