Hello Thanks for query . Pain in groin with enlarged lymph node revealed on C.T Scan needs to be investigated further . What was the histopathological report of Prostate pathology ? Was it a cancer prostate oe Benign Enlargement of prostate ? The cause of pain can not considered to be a part of healing process but has to be suspected to be due to some primary focus of infection in pelvic cavity or secondary to malignancy of s pelvic organ . Consult qualified General surgeon or Urologist for clinical examination and further tests like M.R.I ,Fine Needle Biopsy of lymph node (If required)to trace out the reason for enlarged lymph node . Further treatment will be decided by him based on final diagnosis . Dr.Patil.