Inguinal hernia

Sounds like you have a condition we call "Post Herniorrhaphy Pain Syndrome". Approximately 3-5% of all surgery patients develop some degree of chronic or persistent pain in the region of any surgical incision, and this can be especially bothersome after Hernia repair. Post-operative pain after hernia surgery can occur from a variety of causes and often only with the examination by a surgeon or HERNIA SPECIALIST can identify the exact cause. There are many causes for persistent pain including (but not limited to):

Nerve damage (direct) or entrapment in scar tissue
Post-operative benign nerve tumors (Neuromas)
Scar Tissue itself or tissue damage
Misplaced Mesh (if used)
Contracted, scarified and hardened mesh plugs ("Meshomas")
Infection (usually noted early post-op.)
Recurrent (or Persistent) Hernia.
Constriction of the Spermatic Cord (especially at the internal inguinal ring)
Periostitis from improperly placed suture material
Pain from Unrelated Causes, associated with neither the prior inguinal hernia nor its operative repair (i.e., Non-hernia musculoskeletal, Intra-abdominal, Intra-pelvic, Neurologic, Genito-urinary, Infectious or Vascular origin etc.)
The exact cause of any individual patient's pain cannot be determined of course, nor can specific treatment be recommended without an examination.