Psoriasis 1, also known as psoriasis vulgaris, is related to psoriasis 8 and geographic tongue, and has symptoms including exanthema, pruritus and psoriasiform rash. An important gene associated with Psoriasis 1 is HLA-C (Major Histocompatibility Complex, Class I, C), and among its related pathways/superpathways are Keratinization and Th17 Differentiation. The drugs Vedolizumab and Dapsone have been mentioned in the context of this disorder. Affiliated tissues include skin and t cells, and related phenotypes are arthritis and nail pits