[Psoriasis: a general disease?].

Though particular immunological findings are reported in some cases of psoriasis (increased IgA-, IgE- and IgG-levels, decreased IgM-level, and occurrence of antiglobulin-factors), psoriasis should not be considered as an autoimmune disease. Likewise psoriasis is not a general disease, nor is it a systemic disease. The vascular alterations in the upper corium which are quite regularly found in the apparently-non-affected skin, are probably restricted to the extracerbations of the disease.