psoriatic erythroderma psoriatic erythroderma psoriatic erythroderma represents a form of psoriasis that affects all body sites, including the face, hands, feet, nails, trunk, and extremities.: 410–411 : 195 this specific form of psoriasis affects 3 percent of persons diagnosed with psoriasis. first-line treatments for psoriatic erythroderma include immunosuppressive medications such as methotrexate, acitretin, or ciclosporin. psoriatic erythrodermaother nameserythrodermic psoriasis or von zumbusch psoriasisspecialtydermatology