...and welcome. Hope your stay is brief and that you do NOT have PCa.
Re the rough spot/nodule, as Steve and swimom indicated, this could very well be a calcification. With your low PSA and no symptoms of infection, most docs probably would do as your doc has suggested and ask that you get a biopsy.
On the positive front, less than 50% of these nodules turn out to be cancerous, and with your low PSA, I hope you are in the non-cancerous 50%!!!
Good luck and keep us posted.