Noticing mild stinging pain in groin and testicles, not constant. also notice small amount of white in otherwise clear preejaculate. no other disch?

Many things: your problem will have a long list of possibilities start with possible hernia or hernia in the making others are problem could asociated with your male genitalia from prostate to testicle to epididymis,testicular vein from varicosities to vein thrombosis specially if it was on the left so go and see a urologist get evaluated you will be either assured or treated thank you for using health tap