Redness and swelling of the genitals in six-year-old boys is most often seen in urinary tract infections; in addition, edema of vascular origin both allergic reactions are also easily induced. Most babies are born with a long foreskin, and when there is a urinary tract infection, bacteria can enter the urethra and cause redness and swelling of the foreskin urethral opening. To give povidone-iodine disinfection twice a day. At the same time with anti-inflammatory drugs applied locally, if there are symptoms of septic infection, if necessary, should be timely oral medication. If the baby’s urethra is stimulated by allergic substances can easily cause redness and swelling, which will be accompanied by obvious itching symptoms. To give anti-allergy drug treatment in time, and local saline rinse. Six-year-old boy genitals red and swollen, there may be other causes, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment, the above medication as prescribed by the doctor.