“…Although numerous studies have been performed, the aetiopathogenesis of psoriasis is still not fully understood [Szepietowski et al, 2000;Szepietowski et al, 2001b]. Several internal and external factors could play a role, of which psychological factors are the most important [Fava et al, 1980;Fried et al, 1995;Ginsburg, 1995;Susskind and Mc Guire, 1959;Schmid-Ott, 2000;Zrniç et al, 2001]. Some authors reported a relationship between stress and the onset and exacerbation of psoriasis [Farber and Nall, 1993;Gaston et al, 1987;Gaston et al, 1991].…”