Bacterial vaginosis (BV) produces a thin, watery discharge that is typically gray or white, often with a noticeable fishy smell. It doesn’t look like the thick, clumpy discharge of a yeast infection, and it doesn’t cause the dramatic redness or swelling you might expect from other vaginal infections. In fact, BV can be visually subtle, which is part of why so many people search for images to compare against what they’re seeing.
What BV Discharge Looks Like
The hallmark of BV is a thin, uniform discharge that coats the vaginal walls evenly. The color ranges from grayish-white to a pale yellow, and the texture is often described as watery or slightly foamy. It looks homogeneous, meaning it has a smooth, consistent appearance rather than being lumpy or chunky. You might notice it on underwear as a flat, wet stain rather than a thick glob.
Healthy vaginal discharge varies throughout your cycle, but it’s usually clear to slightly white, without a strong odor. BV discharge is different in three key ways: the grayish tint, the thin and even consistency, and especially the smell. The fishy odor tends to get stronger after sex, which is one of the most reliable signs people notice at home before seeing a provider.
What BV Doesn’t Look Like
BV rarely causes the kind of visible external changes you might expect from an infection. While some people experience itching or mild irritation around the vulva, significant redness, swelling, or sores are not typical of BV. If you’re seeing those kinds of changes on the skin around your vagina, something else may be going on.
This is actually one of the trickiest things about BV. It’s the most common vaginal infection in women of reproductive age, yet about half of people who have it notice no symptoms at all. When symptoms do appear, they’re mostly limited to the discharge and odor, not dramatic visual changes on the outside of the body.
BV vs. Yeast Infection Appearance
These two infections look quite different once you know what to compare. A yeast infection produces thick, white, clumpy discharge that’s often compared to cottage cheese. It tends to leave a white coating in and around the vagina and usually has no odor. The hallmark of a yeast infection is intense itching, redness, and swelling of the vulva.
BV is nearly the opposite in appearance. The discharge is thin rather than thick, gray rather than bright white, and smooth rather than clumpy. The smell is the dominant symptom, not itching. If you’re looking at discharge that’s watery with a fishy odor, that points toward BV. If it’s thick, odorless, and your skin is irritated and inflamed, a yeast infection is more likely.
BV vs. Trichomoniasis Appearance
Trichomoniasis is a sexually transmitted infection that can look somewhat similar to BV at first glance, but there are distinct differences. Trichomoniasis produces a frothy, yellowish-green discharge with a foul smell. The green tint and bubbly, frothy texture set it apart from BV’s flat, grayish-white discharge. Trichomoniasis also tends to cause more irritation, burning, and redness than BV does.
If your discharge has any green color to it or looks distinctly bubbly, that’s not a typical BV presentation.
What a Doctor Sees Under a Microscope
When a provider examines a sample of vaginal discharge under a microscope, they look for something called “clue cells.” These are normal vaginal skin cells that have become so heavily coated with bacteria that their edges look blurred or stippled, almost like the cell has been dusted with tiny rods. In a healthy sample, these cells have clean, sharp borders. Clue cells look fuzzy and granular by comparison.
Providers use a set of four criteria to confirm BV. Three out of four need to be present: the characteristic thin gray-white discharge, a vaginal pH above 4.5 (healthy pH sits between 4.0 and 4.5), a fishy smell when a chemical solution is added to the sample, and the presence of clue cells under the microscope. This means BV is diagnosed through a combination of what it looks like, what it smells like, and what’s happening at a cellular level, not from appearance alone.
Why Photos Can Be Misleading
Most clinical images of BV show a speculum exam with thin grayish discharge visible on the vaginal walls. These photos can be helpful for understanding the general color and consistency, but they have real limitations. Discharge color shifts depending on lighting, camera settings, and how much discharge has accumulated. What looks gray in a clinical photo might look off-white on your underwear.
The bigger issue is that several conditions can produce similar-looking discharge. Relying on photos alone to self-diagnose is unreliable because the visual differences between BV, early-stage trichomoniasis, and even normal mid-cycle discharge can be subtle in real life. The fishy odor is actually a more reliable distinguishing feature than color or texture alone. If you’re noticing a change in your discharge along with that characteristic smell, especially after sex, BV is a strong possibility, but a provider can confirm it quickly with a simple swab.
Signs That Something Else May Be Going On
A few situations suggest you may not be dealing with straightforward BV. If your discharge looks different from any vaginal infection you’ve had before, that’s worth getting checked. The same applies if you’ve recently had a new sexual partner, since some STIs mimic BV symptoms. And if you’ve been treating what you assumed was a yeast infection but your symptoms haven’t improved, the underlying cause may actually be BV or another condition entirely.