<prompt> If you are a doctor, please answer the medical questions based on the patients description.have a thick yellow discharge from penis. notice it first thing in the morning or if havent urinated for a long time. have been tested a number of times for STI s all negative. Have taken antibiotics to try and clear up but it is still happening? No burning sensation or pain or anything else unusual. Partner and I havent had sex since antibiotics or sti tests so its not contracted from partner. Thanks 29y male  <response>: Thanks for asking in Chat Doctor forum In Short: May be smegmaExplanation: Sega is the secretion of glands over glans which gets collected inside the prepuceforeskin may be the cause. So, please make a habit of washing your penisglans foreskin daily during bathing and each time after ejaculation. Hope you get relief by this. No need to worry be happy. Please let me know if you have other symptoms. 