The redness and swelling of a boy’s genitals can be caused by inflammation or trauma. If it is caused by the inflammation of the foreskin or glans, can be cleaned with herbal lotion, and after cleaning, the child can be coated with Pepto-Bismol ointment. At the same time, we should pay attention to the genitals to keep ventilated and dry, avoid wearing thick pants, which is not conducive to ventilation and is not conducive to improvement. You should let the child drink more water to flush the urethra, which is conducive to the cure of inflammation, and do not take fish, shrimp, eggs, beef and mutton by mouth during the disease, which is not conducive to the cure of inflammation. If it is due to trauma caused by the appearance of local hematoma, can not be handled at home, to avoid hematoma aggravation affecting the pediatric urination and other conditions. Need to actively go to the pediatric urology department, under the guidance of the doctor to deal with before further treatment.