The "present problems" at the bottom of your post don't ring any bells with respect to TC. The main issue are the bumps you've found. Your first order of business is to see a urologist and to get a script for an ultrasound. It's quite likely this is something entirely benign but, since you're concerned, allay those concerns by getting the US.
TC1: 1996, right orchiectomy, seminoma stage I 3.5 cm mass, radiation therapy (peri-aortic & pelvic 27.3 Gy)
TC2: 2008, left orchiectomy, seminoma stage IA 5 cm mass, left & right prostheses, AndroGel TRT, surveillance at MSKCC