"My question is could I have a hernia without any noticeable bulge or lump? I'm fairly skinny very low body fat. The pain has become much more constant on my groin area since he stuck his finger in the hole."
Answer to first question ... yes
I do not notice any bulges but have a hernia. Coughing hard a few times or pushing while leaning forward is a sure way for me to feel pain.
I didn't have that many symptoms at first but now I get them a lot more.