Background: Psoriasis is a multifactorial disease of unknown origin. Objective: Our purpose
was to determine the frequency of skin disorders concomitantly seen in patients with
psoriasis. Methods: We analyzed data from more than 40,000 patients and calculated sex-
and age-adjusted ratios of expected and observed incidence rates of associated disorders.
Results: The results demonstrate that, compared with age-matched control patients without
psoriasis, cutaneous immune disorders such as allergic contact dermatitis, atopic dermatitis …