Thanks for your query.Based on the facts that you have posted it appears that you have been operated for undescended Testis
on left side at he age of 24 years.
Your recent semen analysis revealed 8-10 pus cells which suggests infection either in seminal vesicle
Please take antibiotics like combination of Trimethoprim and Sulphamethoxazole
twice daily for one month and repeat your semen analysis after completion of course of antibiotics.
Hopefully it will get resolved.
Consult qualified Urologist
for clinical evaluation and further treatment.