I'd punt on a hernia.
In a man, an inguinal hernia develops in the region where the spermatic cord and blood vessels to the testicles pass out of the abdominal cavity and into the scrotum. The area where these pass through is called the inguinal canal.
In a reductible hernia the protrusion can be put back into place.
In an incarcenated hernia the protrusion can't be put back into place without surgery because some surrounding tissues or parts have grown together.
In a strangulated hernia the protrusion becomes twisted or swollen and interferes with the normal blood flow and muscle action. Immediate surgery is needed in this type of hernia.
Symptoms of Inguinal Hernia
Frequently hernias produce no symptoms. However, some people may experience the following symptoms:
* A lump or swelling in the groin
* A sudden pain into the scrotum
* Abdominal discomfort
* A heavy feeling in the groin
* Pain in the groin while standing or moving
Diagnosis of Inguinal Hernia
If the lump is large, the doctor can see an obvious swelling or lump in the groin. If the hernia is small the doctor will examine the groin area for a bulge in the affected area.
Treatment of Inguinal Hernia
See a doctor though it could well something much more sinister.