Vaginal infections typically show up as a change in discharge color, texture, or smell, often alongside visible redness or swelling of the vulva. What it looks like depends on the type of infection, and the three most common types each have distinct visual signatures that can help you tell them apart.
What Normal Discharge Looks Like
Before spotting something abnormal, it helps to know the baseline. Healthy vaginal discharge is clear, milky white, or slightly off-white with no strong odor. Its thickness shifts throughout your menstrual cycle. Around ovulation, it tends to become slippery and wet, almost like raw egg whites. At other times it can be sticky, pasty, or barely noticeable. These changes are all normal and don’t signal infection.
The key things that distinguish infection from normal variation are a noticeable color shift (gray, green, yellow), a new or strong smell, a dramatic change in texture, or the appearance of irritation on the skin of the vulva.
Yeast Infection: Thick, White, Cottage Cheese Discharge
A yeast infection is the most visually recognizable type. The hallmark is a thick, white discharge that looks like cottage cheese. It’s usually clumpy or lumpy rather than smooth, and it has little to no odor. That last detail is important, because many people expect infections to smell bad. With yeast, the visual is the giveaway, not the scent.
Beyond the discharge, yeast infections cause visible redness and swelling of the vulva. The skin around the vaginal opening often looks puffy and irritated. In severe cases, the irritation can progress to small cracks, tears, or sores on the vulvar skin. You might also notice thick, whitish patches that feel scaly. Redness can be harder to spot on darker skin tones, so swelling and texture changes are more reliable visual cues in that case.
The accompanying sensations are intense itching, burning during urination, and pain during sex. Of the three main infection types, yeast is the one most associated with itching and visible skin irritation.
Bacterial Vaginosis: Thin, Grayish Discharge With a Fishy Smell
Bacterial vaginosis (BV) looks quite different from a yeast infection. The discharge is thin and homogeneous rather than clumpy. It’s typically off-white, gray, or sometimes greenish, with an even, almost milky consistency. The defining feature isn’t really how it looks but how it smells: a fishy odor that often becomes stronger after sex.
One of the most useful visual distinctions is what BV does not cause. Unlike yeast infections, BV typically doesn’t produce significant redness, swelling, or itching of the vulva. If you notice a change in discharge and smell but your skin looks and feels relatively normal, BV is more likely than yeast. That said, some people do experience mild irritation with BV, so the absence of skin symptoms isn’t a guarantee.
BV is the most common vaginal infection in women of reproductive age. It happens when the normal balance of bacteria shifts, allowing certain types to overgrow. This raises the vaginal pH above 4.5 (healthy is around 4.0 to 4.5), which is one reason over-the-counter pH test strips sometimes appear in self-screening kits.
Trichomoniasis: Yellow-Green, Frothy Discharge
Trichomoniasis is a sexually transmitted infection caused by a parasite, and its discharge looks noticeably different from both yeast and BV. The discharge is typically yellow or green, thin, and frothy, almost foamy in texture. It also carries a foul smell, though not always the same “fishy” quality associated with BV.
Trichomoniasis tends to cause more dramatic irritation than BV. Redness and itching of the vulva are common, along with burning during urination or sex. In about 40% of cases, a healthcare provider examining the cervix will see a pattern of tiny red spots sometimes called a “strawberry” appearance, caused by small areas of inflammation. You wouldn’t see this yourself, but it’s one of the ways a clinician confirms the diagnosis during an exam.
The vaginal pH with trichomoniasis is usually well above normal, often greater than 5.4, which reflects significant disruption of the vaginal environment. Because it’s sexually transmitted, trichomoniasis requires a different treatment approach than yeast or BV, and sexual partners need treatment too.
Quick Visual Comparison
- Yeast infection: Thick, white, clumpy (cottage cheese texture). Little or no odor. Significant redness, swelling, and itching of the vulva.
- Bacterial vaginosis: Thin, gray or off-white, even consistency. Fishy smell, especially after sex. Minimal vulvar irritation.
- Trichomoniasis: Yellow-green, thin, frothy. Foul odor. Redness, itching, and burning of the vulva.
Skin Changes That Signal Something More Serious
Most vaginal infections cause relatively mild skin changes: some redness, maybe mild swelling. But certain visual signs point to a more severe or complicated situation. These include blisters on the vulva (which can burst, ooze, and crust over), deep cracks or fissures in the skin, open sores, or unusual bleeding. Severe swelling and itching that leads to tears in the vaginal tissue also falls into this category.
Blisters and ulcers in particular are not typical of yeast, BV, or trichomoniasis. Their presence raises the possibility of a herpes outbreak or another condition entirely. Skin that becomes chronically thickened, scarred, or extremely dry can result from prolonged untreated inflammation and warrants a closer look.
If you’ve never had a vaginal infection before, it’s worth getting a professional diagnosis the first time rather than guessing based on appearance alone. The visual overlap between infection types is real. Studies show that even experienced clinicians can’t always distinguish them without testing. A simple exam with a sample of discharge under a microscope, a pH check, or a swab test gives a much more reliable answer than visual assessment alone, and it ensures you’re treating the right thing.
Why Visual Self-Diagnosis Is Tricky
The descriptions above are the textbook presentations, but real infections don’t always follow the script. Yeast infections sometimes produce thin, watery discharge instead of the classic cottage cheese. BV discharge can look white enough to be mistaken for yeast. Trichomoniasis doesn’t always produce the dramatic green, frothy appearance. And it’s possible to have more than one infection at the same time, which blurs the visual picture further.
Color, texture, and smell are useful starting points for narrowing down what’s going on. But they work best as clues to bring to a healthcare provider rather than as a final answer. Over-the-counter yeast treatments are widely available, and they work well when it actually is a yeast infection. But using them for what turns out to be BV or trichomoniasis won’t help and can delay effective treatment.