Hello , I understand your concern. I am Dr. Arun Tank, infectious disease specialist, answering your concern. It is likely to be not a infection of urinary tract. Some times a small water drinking may cause burning in urine. When you drink plenty of water on other day such burning may disappears. As you are mentioning you are not sexually active with any one else other than your wife, this complaint is not of the STI also. In my advice take plenty of water, as much as you can take. Please maintain the local cleanliness. Frequent cleaning and dressing can improve the condition rapidly. I will be happy to answer your further concern you can contact me here or you can contact me on bit.ly/DrArun We wish you a best health at healthcare magic. Thank you, Dr. Arun Tank