A small red pimple on the penile tether, three or four days ago, is considered to be caused by the foreskin glans, genital herpes, warts and other diseases. 1. glans penis: glans penis is mostly caused by pathogenic microbial infections, but can also be due to genital area trauma, circumcision and other non-infectious factors, the patient can be due to inflammation stimulation of the penile ligament, resulting in the penile ligament with a small bumps, and glans mucous membrane can be congested, swollen phenomenon, accompanied by itching and other discomforts. 2. Genital herpes: due to herpes simplex virus infection of the genitals and perianal skin and mucous membranes, male patients, the foreskin, glans, penile ligament and other parts of the small red bumps, hard knots and other phenomena, accompanied by a burning sensation, pain. 3. Condyloma acuminatum: a sexually transmitted disease caused by HPV infection, male patients glans, penis, penile ligament and other parts of the glans, may appear reddish pimples, soft texture, sharp tip, with the development of the disease, the lesions can gradually develop into corns or cauliflower-shaped warts. In addition, there are many other causes can cause a small red bump on the penile tether for three or four days, it is recommended that patients go to the hospital in a timely manner, to clarify the cause of the disease, and then receive treatment as soon as possible.