The most likely reason for itchy, red and swollen genitals is that there is an infection in the genitals, and it is important to note if there is any discharge. If there is discharge, you can take the discharge to do a smear test to check whether it is a bacterial infection or a mold infection. It is recommended that the genitals should be cleaned and kept dry every day, and the underwear should be changed frequently every day so as to avoid infection. If the smear test is caused by bacterial infection, you can apply erythromycin and gentamycin ointment on the genitals, and usually it can return to normal in 3-5 days. If it is caused by mold infection, you can use Dakinin ointment topical, usually about 5 days can return to normal. After returning to normal, you must wash it every day to keep it clean, only then can you avoid reoccurrence of infection.