https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4207690/ - this suggests that it has no affect on your semen, which I'm assuming you had analyzed for infertility purposes or prostatitis, maybe.
You may not need treatment. If you are just finding out for fertility reasons, it's probably not causing any issues, and could be there naturally. We have lots of naturally occurring bacteria in our bodies.
If there's a possibility of prostatitis, it's important that the doctor does a sensitivity test. This is where the lab determines what antibiotic the bacteria will respond to. There is some antibiotic resistance, so getting the proper treatment first is important.
https://www.healthline.com/health/pseudomonas-infections#treatment