In the study presented here, transplants of normal and pathological skin were done on 9 patients with active psoriasis. The transplantation of skin lesions from one site to another on individual patients has been done in the past to study dermatological problems. Haxthausen2 mentioned in a paper entitled, "Studies on Pathogenesis of Morphea, Vitiligo and Acrodermatitis Atrophicans by Means of Transplantation Experiments," the fact that he performed "some" such studies on psoriasis. He stated, "As a rule, psoriasis transplanted to normal skin preserves its pathological character and sometimes extends, and normal skin placed in a psoriatic lesion becomes involved with psoriasis." He notes that there are irregularities seen and that any conclusions will have to await further study. He made no mention here of the number of cases or of control procedures in his study.
Nine patients with psoriasis were selected for the transplant procedure. Seven were white
LONG PI. Behavior of Psoriatic and Normal Skin Transplants. Arch Dermatol. 1961;84(4):593–596. doi:10.1001/archderm.1961.01580160057007