Vaginitis changes how your vaginal discharge looks, and often causes visible redness or swelling around the vulva. But the specific appearance depends on which type you have. The three most common forms, bacterial vaginosis, yeast infections, and trichomoniasis, each produce a distinct combination of discharge color, texture, and odor that can help you tell them apart.
Bacterial Vaginosis
Bacterial vaginosis (BV) is the most common type of vaginitis. It happens when the normal bacteria in the vagina get crowded out by an overgrowth of other organisms. The hallmark is a thin, watery discharge that can look white, gray, or greenish. It tends to coat the vaginal walls evenly rather than appearing in clumps. The most distinctive feature isn’t visual at all: it’s a strong, fishy odor that often gets worse after sex.
Unlike yeast infections or trichomoniasis, BV typically does not cause noticeable redness, swelling, or inflammation of the vulva. So if you’re seeing a thin, off-color discharge with a foul smell but no major irritation on the skin, BV is the most likely culprit. Vaginal pH rises above 4.5 with BV, compared to the normal range of 4.0 to 4.5 for women of reproductive age.
Yeast Infections
A vaginal yeast infection looks noticeably different from BV. The discharge is thick, white, and lumpy, often described as resembling cottage cheese. It usually has little to no odor, which is one of the easiest ways to distinguish it from bacterial causes.
The more visible signs tend to show up on the vulva, the outer tissue around the vaginal opening. You may notice redness, swelling, and skin that looks irritated or inflamed. In more severe cases, the skin can develop small tears, cracks, or raw patches from intense itching and scratching. Vaginal pH typically stays in the normal range (below 4.5) during a yeast infection, which is why pH alone isn’t enough to rule one out.
Trichomoniasis
Trichomoniasis is a sexually transmitted infection caused by a parasite, and it produces a discharge that looks different from either BV or yeast. The discharge is typically yellow or green and can appear frothy or bubbly. It carries a foul odor and is often accompanied by vaginal soreness and pain during sex or urination.
During a pelvic exam, a healthcare provider may notice what’s called a “strawberry cervix,” tiny red spots scattered across the surface of the cervix that give it a speckled, strawberry-like appearance. This isn’t something you’d see on your own, but it’s a strong clinical indicator. Vaginal pH with trichomoniasis tends to climb higher than with BV, often reaching 5.0 to 6.5 or above.
Skin Irritation That Mimics Vaginitis
Not all vulvar redness and irritation comes from an infection. Contact dermatitis, caused by an allergic or irritant reaction to soaps, laundry detergent, menstrual products, or even certain fabrics, can look surprisingly similar. It typically appears as red, raised patches or small bumps that may merge into larger areas of irritation across the vulva, perineum, and surrounding skin. The key difference is that contact dermatitis doesn’t usually produce the characteristic discharge changes seen with BV, yeast, or trich. It’s more of a skin problem than a vaginal one.
Other chronic skin conditions like lichen sclerosus, lichen planus, and psoriasis can also affect the vulva and mimic the redness and irritation of infectious vaginitis. If your symptoms keep coming back despite treatment, or you have irritation without any abnormal discharge, a skin-related cause is worth exploring.
Atrophic Vaginitis After Menopause
In postmenopausal women, vaginitis often has a completely different appearance. Falling estrogen levels cause the vaginal tissue to thin out and lose moisture. On exam, the tissue looks pale, smooth, and dry, lacking the folds (called rugae) that normally line the vaginal walls. The labia may appear smaller, with less subcutaneous fat and sparser pubic hair. The tissue becomes fragile enough that it can bleed easily with light contact.
This form of vaginitis doesn’t produce the heavy or discolored discharge associated with infections. Instead, the main visual signs are dryness, pallor, and tissue that looks almost shiny or papery thin.
Why Self-Diagnosis Is Unreliable
Even with these visual differences, correctly identifying which type of vaginitis you have based on appearance alone is harder than it seems. In a study of women attempting to self-diagnose, accuracy for identifying bacterial infections (BV or trichomoniasis) was only 56%. Self-diagnosis of yeast infections was somewhat better at 69%, but the positive predictive value was just 38%, meaning that most women who believed they had a yeast infection actually had something else.
About 20% of women who self-diagnosed a bacterial infection were wrong and would have used the wrong medication. And roughly 25% of women with an actual infection missed it entirely. These numbers matter because BV and trichomoniasis require prescription antibiotics, while yeast infections use antifungals. Using the wrong treatment doesn’t just fail to help; it gives the real problem more time to persist or spread.
Quick Comparison by Type
- Bacterial vaginosis: Thin, gray or white discharge. Fishy smell. No significant redness or swelling. pH above 4.5.
- Yeast infection: Thick, white, cottage cheese-like discharge. Little or no odor. Red, swollen vulva. Normal pH.
- Trichomoniasis: Yellow-green, frothy discharge. Foul odor. Soreness and possible strawberry cervix on exam. pH of 5.0 to 6.0 or higher.
- Contact dermatitis: Red, bumpy, or patchy skin on the vulva. No abnormal discharge. Triggered by irritants or allergens.
- Atrophic vaginitis: Pale, dry, thin vaginal tissue. No folds. Fragile skin that bleeds easily. Minimal discharge.
A simple in-office test, where a provider checks vaginal pH and examines a sample of discharge under a microscope, can distinguish between these types in minutes. Given how different the treatments are for each one, that quick test is often the fastest path to relief.