“…We performed a literature review of cases of granulomatous secondary syphilis in which the diagnostic work-up included immunohistochemistry for the detection of spirochetes in skin biopsy specimens. Table 1 summarises the main findings observed in these cases [ 2 , 3 , 5 , 6 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ].…”