Bulge in taint when coughing?

I have been dealing with perineum (taint), and groin pain for quit some time now. Doctors dont know what it is, they think it might be a sports hernia but havent found anything yet. I notice when i cough or flex my abs the perineum bulges out a little and retracts when i finish coughing or relax my abs. Basically im just asking if this is normal