You may want to be evaluated for STDs, such as herpes, gonorrhea, or chlamydia. A urethral swab or urine tests would be an appropriate initial evaluation. Tests for herpes can also be discussed.
If infectious diseases have been ruled out, then irritation, a dermatitis, or topical fungal infection can be considered. A dermatology referral can be considered for further evaluation and treatment (i.e. steroid cream for dermatitis, anti-fungal cream for a fungal infection).
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.
Thanks,
Kevin, M.D.