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The sign of Leser–Trélat is a paraneoplastic phenomenon consisting of a sudden eruption of seborrhoeic keratoses. It is credited to two surgeons, Edmund Leser (1853–1918) and Ulysse Trélat (1827–1890), who described cutaneous lesions associated with internal malignancies. Edmund Leser, the author of the Textbook of Special Surgery in 50 Lectures, initially studied law in Bonn before qualifying in medicine in Leipzig in 1880. He became Richard von Volkmann’s assistant at Martin Luther University. He was awarded his chair of surgery in 1894, 10 years after becoming a surgeon, and he practised in Goethe University, Frankfurt. Ulysse Trélat was born in Paris in 1827. His father was a republican political activist, Minister of Public Works and known as the founder of public hygiene in France. Ulysse Trélat was employed as an assistant anatomist in surgery at the ‘École Pratique’ 1 year before graduating high school in 1844. He finished his medical studies in 1854 and became a surgeon in 1857. In 1858, he was running the anatomy course in ‘École Pratique’. He replaced Paul Broca, well known for his research on Broca’s area in the frontal lobe, at Hospital Necker in 1880. In 1884, he was awarded a chair of surgery at ‘Hospital de la Charite’, replacing Leon Athanase Gosselin. Notable among his works is the description of the ‘Baizeau and Trélat method’ of surgical repair of cleft palate, and his book Clinique Chirurgicale. Leser and Trélat independently published papers describing skin lesions associated with mammary carcinoma and visceral malignancies. However, their description of cutaneous lesions was more in keeping with the appearance of senile angiomata or Campbell de Morgan spots. Therefore, the credit should go to Eugen Von Hollander (1867–1932), another German surgeon who accurately described the lesions in a paper published in 1900 titled ‘Contributions to the early diagnosis of intestinal carcinomas’. He observed skin changes associated with internal malignancies consisting of an eruption of flat, shiny, pigmented, glandular, epithelial growths similar to seborrhoeic warts or verrucae seniles in young patients with cancer. He hypothesized that there might be a link between abnormal epithelial proliferation in internal organs and skin keratinocyte proliferation. He is remembered for performing the first facelift, on a Polish aristocrat in 1912. The sign of Leser–Trélat is so deeply embedded in medical literature and the minds of modern practitioners that it is unlikely to ever be erased. However, the contribution of Eugen Von Hollander should not be forgotten.