Swelling of man’s organs generally means that the swelling of genitals may be caused by trauma, allergies, local infections, as well as other reasons such as genital tumors. 1. Trauma: when a man’s genitals are traumatized, the soft tissues will become edematous, and at this time the genitals will bleed and swell. 2. Allergy: If men wear chemical fiber underwear or apply ointment or lubricant on top of their genitals, it may lead to genital allergy, which may cause swelling, itching, pain and other manifestations in the genitals. 3. Local infections: If the genitals are infected with pathogens such as mycoplasma, virus, gonococcus, chlamydia, etc., symptoms such as swelling and pain in the genitals may occur. 4. Other: men with enlarged genitals are also considered to be caused by genital tumors. It is recommended that men with enlarged genitals need timely medical examination and early treatment. In addition, the patient usually need to keep the genital area clean and dry, avoid local injury.