Hello,
The spots on your undergarments can be due to prostatic fluid which is normally secreted. But if the symptoms are severe then the possibility of prostatitis has to be ruled out. Culture sensitivity of the prostatic fluid before and after discharge and ultrasound of prostate to look for any inflammation need to be done if prostatitis is suspected.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
Hi, I doubt very much that the spots are semen, but if you have a discharge it is best to consult with a doctor.
All the best
Ron