A buddy of mine got one lifting weights. He looked real tough when he came back to school with an inflatable dough nut.
Not to make light of your situation OP. I'm sorry to hear that. I am a bit heavy too and my saddle isn't the best, ergonomically speaking. I've never gotten a 'roid but working construction in the summer I have suffered some nasty ADR (adult Diaper Rash)
I really ought to upgrade my saddle.
Good luck man. Hopefully you can rid yourself of them or at least tame them without going under the knife.