something hard under wound

I got an inguinal hernia repair on the 22nd of December. Had stitches on until the 5th of Jan. Friday night I felt my wound (healing well, now its just a red line to be honest) and I felt something ahrd, like a piece of plastic/metal/other hard material. I could feel two ends, so I assumed this hard material is 3cm. If I stand in a certain position, or perhaps lie down flat, you can see where the hard 'piece' ends, and the lump goes down (there's a small lump now, which I assume is normal due to the wound healing.)

My surgeon most probably, if not certainly, used mesh, but whats this hard piece Im feeling? It causes no pain, I don't really notice it, but should I be worried?

Edit: It jsut occured to me, but perhaps this is a bone? On the opposite side (my left) I can no doubt feel bones if I push hard, and perhaps the bone has risen due to the wound placement? But it feels very thin...