Syphilitic lesions A. Primary syphilis. A syphilitic chancre is shown on the foreskin of the penis Note the sharp edge and raw base of the ulcer Source: Ryan KJ, Ray CG: Sherris Medical Microbiology, sth Edition www.accessmedicine.com Copyright io) The McGraw-Hill Companies, Inc. All rights reserved 2016/5/12 Spirochetes-Junqi's Lecture for Medical studentsSyphilitic lesions. A. Primary syphilis. A syphilitic chancre is shown on the foreskin of the penis. Note the sharp edge and raw base of the ulcer 2016/5/12 Spirochetes-Junqi's Lecture for 11 Medical Students