OK, thing about real docs is they’re a tad wary of this sort of thing as “sore lump in the groin” isn’t much to go on (amuse yourself and google that phrase). I’m not a real doc and I’m also sure as hell not going to tell you what’s wrong or how to fix it
IF your ediagnosis is correct, presumably we’re going to blame cycling for it ? (ie you have no other risk factors that google will have offered you for it and maybe you’ve had a heavy landing or two recently on your saddle)
IF so, then yeah, I imagine you’ll be staying off the bike for a bit and then I’d be maybe trying a different saddle or at least checking that it’s well set up currently
that said, I’m still going with plague