A lump, bulge, or swelling in the groin most commonly occurs after an injury. Sometimes the injury is so minor you do not notice it at the time. Home treatment usually will relieve symptoms.

An infection can cause lymph nodes to swell. Infection in the leg or foot as well as in the testicles, penis, or scrotum may cause lymph node swelling in the groin. If the infection is minor, the swelling may last a few days and go away on its own. When an infection is more serious, lymph nodes may be warm and tender to the touch. Redness may develop and the swelling may increase. When there are signs of infection, it is important to find out what is causing the infection. Lymph nodes may stay enlarged for up to 4 weeks after an infection. This is normal and not serious.

Certain diseases may increase your risk of a serious infection. People with diabetes, peripheral arterial disease, or an impaired immune system may require medical treatment at the first signs of infection.

An inguinal hernia is a bulge of soft tissue through a weak spot in the abdominal wall in the groin area. An inguinal hernia may need surgical treatment.