Leaking pre cum like liquid specially when i do a walk! i stops in the night but during the day it is constant like very little comes out but very often! also i consulted a urologist he said that it will go automatically for 1-2 years! no infection?

Hmm... it seems you have urethral discharge. If you are sexually active, it's likely you have nongonococcal urethritis (NGU), an STD. Standard STD testing often is negative even though NGU is an STD. Whether sexually active or not, discuss again with your urologist, or consider getting a second opinion. Good luck.

Precum is a secretion which comes out after sexual excitation. It might not be precum but secretions from the glands- prostate or the urinary tube (urethra). Best is to see a Urologist at an academic center. good luck