Psoriasis is not contagious. Generally contagious diseases are caused by pathogen infections such as bacteria, parasites and fungi. The causes of psoriasis, on the other hand, are mainly environmental, immune, genetic, mental and other aspects, which have no relationship with pathogen infection, so psoriasis does not have the conditions of contagiousness, so it is not contagious. Treatment of psoriasis usually uses medication, such as anti-inflammatory through local topical medication to inhibit the proliferation of skin cells, such as mometasone furoate cream, tacrolimus ointment, carbotenoids ointment and so on. You can also take oral medication for anti-inflammatory and inhibit cell proliferation, such as Avicenna, Methotrexate, Cyclosporine and so on. It is recommended that patients go to regular hospitals in time, and standardized treatment under the guidance of professional knowledge.