In some cases, a fishy or unpleasant odor may also result from poor hygiene, trapped sweat, or wearing tight clothing that doesn’t allow the area to breathe. Proper hygiene and breathable fabrics can usually address this issue.
Another possible cause is trichomoniasis, a sexually transmitted infection (STI) caused by a parasite. This condition also leads to an unpleasant odor and other symptoms but must be treated with prescribed medication—not home remedies.