Hello and welcome to HCM,
A hard painful lump in the groin area could be due to a number of causes.
To name a few,
1. Lymph node
2. Mass arising from spermatic cord
3. Soft tissue
is unlikely to produce a hard mass. Most of the times the hernia transmits the impulses associated with cough, sneezing
A CT scan
is needed to determine the origin of the mass and its other characteristics.
exposure is associated wit CT scan however, an exposure now and then does not have a deleterius effect.
It is the chronic long time exposure is harmful.
The investigation is necessary as the further management depends on the result of the test.
It is difficult to say whether the swelling is malignant or not.
Imaging and biosy are required for exact diagnosis.
Thanks and take care.
Dr Shailja P Wahal