Studies of Inoculability and Transplantability of Seborrheic Keratoses**From the Department of Dermatology, School of Medicine, University of Pennsylvania, Philadelphia 4, Pennsylvania.This study was conducted under the sponsorship of the Commission on Cutaneous Disease of the Armed Forces Epidemiological Board and was supported in part by The Surgeon General, Department of the Army and in part by a grant from the National Institutes of Health, P.H.S. C-2912 (C-4).