How concerned should I be?

[trid2bnrml]

my 1 yr old male cat now has quarter-sized, soft lump on his rt side, about halfway between his f and r legs, and 2-3 in. below where I feel his spine. It doesn't seem to hurt him when I press on it. It is underneath unbroken skin. I can find no visual evidence of trauma. The lump reminds me of the consistency of a calciferous cyst that I once felt on a human, but a little softer.

He did, however, go to his box and squat a couple of times, to no avail, but then later, there was a normal-looking result, firm, no blood or anything unusual.

I most want to know if the lump could be in the proximity of his bowels. I've applied light pressure to his "groin" area, if that's what it's called, but there were no hard areas or lumps, or apparent pain that i could tell...but I don't know much about animal anatomy.

What are your educated feelings, please?

I could post a picture to point to exactly where the lump is, if that would help.