Men’s penis has a foul odor is may be a long time without cleaning caused by, but also may be the glans, warts, prostatitis and other diseases caused by. 1. Long-term failure to clean: patients who have not cleaned the penis for a long time or cleaning is not clean, will lead to penile secretions or urine and other adherence to the penis, so the patient will appear in the phenomenon of penile odor. 2. Glansitis: Glansitis is caused by microbial infections such as bacteria, fungi or allergies as well as their own diseases. Glans can cause the patient’s glans to ulcerate and ooze, thus the odor appears. 3. Condyloma acuminatum: Condyloma acuminatum is mostly caused by HPV infection, the patient’s penis will appear reddish cauliflower-shaped small particles, accompanied by itching, bad smell and other symptoms. 4. Prostatitis: If you suffer from prostatitis, you can have purulent secretions, causing odor in the perineum. In addition, there are many other reasons that can cause a guy’s penis to have a bad odor, and he should seek medical attention in a timely manner.