STDs and other infections should be considered and ruled out.
This can be done with a urethral swab or urine test, looking for gonorrhea or chlamydia. I would also consider a urinalysis as well as a rectal exam to evaluate the prostate.
Herpes, syphilis as well as chancroid can also be considered. A swab of the lesion and sending the specimen out for appropriate testing can help in narrowing down the diagnosis.
I would discuss these options with your personal physician. I cannot make specific recommendations as to whether you should be going to the emergency room over the internet.
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.
kevinmd_b