Foul yellow discharge returning, already treated for chlamydia what is the cause? ive had no sexual contact.and my check up results were negative.

Recheck: Go back to doctor. Yeast(chlamydia) which you were treated for usually gives a white usually odorless discharge.Trichomonas(a protozoa) usually gives a frothy greenish yellow discharge with foul odor and itching.Bacterial vaginosis gives a thin milky fishy odor discharge.The treatment is not the same for all types so go to your gyn. Hope you feel better soon.