Prostatitis should be considered, as well as urethritis. These diseases can be evaluated first with a urinalysis, which can suggest infection. If negative, you can consider a thorough digital rectal exam to evaluate the prostate, as well as a transrectal ultrasound which can image the prostate for possible abscesses.
If a non-infectious cause has been ruled out, things like dermatitis or a fungal infection can both be considered.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
Medical Weblog:
kevinmd_b