I am an 18 year old teenage boy, concerned about penis discharges that i am having. It looks almost like a whitey milky (sometimes yellowish) sticky fluid that only appears after i defecate and its appearance is not consistent. I will see it one month and never see it again until months later or an entire year. i first notice it few years prior to my recent concern of it when i had some issues relating to a pain i was feeling behind my ears caused by dust particles the Otolaryngology said. Thus i was taking some pills for the pain and that's when i first saw it.I thought it was a side effect the pills caused so i never paid it any mind and forgot about it. Recently, earlier in the year i saw it again but i had unprotected sex and thought i had caught an sti. I went to my doctor and he prescribed antibiotics for it. i finish the pills and thought everything was ok again but it wasn't because i am still seeing this discharge so evidently its not an sti. Keep in mind that i have no symptoms of redness, itching, pain, burning when i urinate, swelling, none whats so ever just the discharge after i defecate. What do you think it is why am i seeing it and how do i stop it from happening?