After having bacterial orchitis in my left testicle about 2-3 months ago it is now twice as "fat" as the other. no pain. no bumps at all. scar tissue?

See your doctor: There's no way to give useful advice online for this sort of problem; it needs in-person evaluation. See the doctor who treated you, or consult with a urologist if you haven't done so previously. If there is any doubt about the original diagnosis, further evaluation may be recommended to assure no other infection, like tuberculosis or a fungal infection; or testicular cancer. Good luck.

Possibly: You will need a thorough examination by your physician as well as a testicular ultrasound. I suggest a urology consultation.

Here are some ...: The resultant effect of orchitis tends to diminish its size and soften its consistency. If instead it became bigger, it may represent the occurrence of hydrocele, which may be accurately defined by detailed Hx, proper palpation and transillumination (if light-colored skin), and scrotal ultrasound study. So, if still in doubt, seek pro-evaluation and counseling. Earl, it's nice to hear from you.