It is hard to identify any bumps on the skin without seeing them via a visual examination. However, the location of the bumps indicates that they are not scar tissue from an inguinal hernia. An inguinal hernia is located next to the root of the penis, instead of on the underside where you locate the bumps.
The scar tissue after surgery is located on the same place as the inguinal hernia. An inguinal hernia is a condition in which part of the intestines are out of the abdominal cavity, passing through the inguinal canal into the scrotum (the skin bag where the testicles are located).
In order to receive more detailed info, you might want to send the photos to
doctor@ehealthforum.com.
You might want to visit a dermatologist to determine the true nature of the bumps.