Would it concern me? Not unless I had symptoms, such as having trouble pissing.
I've had Benign Prostate Hyperplasia for going on 20 years. I'm up every 3 hours all night to pee. My PSA has been as high as 16. I take finasteride, which helps shrink the prostate and cuts the PSA numbers about in half. I'm testing at 6 now, which my urologist says means it's really about 12. I've had multiple biopsies and one full body bone scan. They really put me through the wringer. I'm not worried about it anymore.
It's been a rough couple of months (long post)