<s>[INST] Hello doctor,There is a white discharge coming from my penis, please. [/INST] Hello. What you are describing is a urethral discharge (yellow/ white milky material) with dysuria (painful urination). If a male patient presents with these two symptoms and a doctor confirms that there is a discharge as shown on your photo (attachment removed to protect patient identity), then it can usually be diagnosed and treated according to a specific schedule. The two most common causes of acute urethral discharge are both sexually transmitted infections (STI's) caused by chlamydia or gonorrhea bacteria. These infections are contracted from a sexual partner during sexual intercourse and it is therefore very important for the sexual partners also to be treated and to test for HIV (human immunodeficiency virus). A doctor will also usually make sure there is no ulcer (open sore) on your genitals. A sample of the discharge can be sent away for testing, but if it is the first episode (time) this usually is not necessary and one can be treated immediately without sending the discharge to the laboratory. From your symptoms and history, the most likely diagnosis would be a sexually transmitted infection (gonorrhea/ chlamydia) or a urinary tract infection if there is no sexual activity. According to that, you would have to be treated as follows: Hope this helps you. For more information consult an internal medicine physician online --> </s>