Early symptoms of syphilis in men include chancre, sclerosing lymphadenitis, syphilis rash and flat warts. 1. Hard chancre: syphilis spirochetes invade the lesion site, preferably in the penile coronal groove, prepuce, glans, perianal area, etc., which manifests itself as a small area of erythema and papules, and with the development of the disease a hard knot is formed on the surface, and after necrosis occurs, a painless round or oval ulcer is formed, with plasma secretion, and with cartilaginous hardness to the touch, i.e., the hard chancre. 2. Sclerosing lymphadenitis: 1 to 2 weeks after the appearance of the chancre, a hard enlargement of the lymph nodes in the groin or in the vicinity of the affected area often occurs, usually without pain and without a tendency to pus and ulceration, and it often takes several months for it to subside, i.e. sclerosing lymphadenitis. 3. Syphilitic rash: after the hard noma has subsided for some time, the skin and mucous membranes all over the body may show the clinical symptoms of syphilitic rash, including blotchy rash, papules, pustules, etc., which may be distributed in many areas, such as the trunk, the limbs, and the face, etc. The symptoms of syphilitic rash may also be present in the skin and mucous membrane of the whole body. 4. Flat warts: occurring in the perianal area and external genitalia and other parts of the skin that are moist and easy to friction, manifested as hypertrophic plaques, with a flat surface and vesicles. Early syphilis is highly contagious. If symptoms such as hard chancre and sclerosing lymphadenitis appear, it is recommended to go to the hospital for diagnosis and treatment under the guidance of a doctor.