Redness and swelling around the vagina and vulva usually signal irritation or infection, and the most common cause is a yeast infection. But several other conditions can look and feel similar, so the specific pattern of your symptoms, especially the type of discharge and whether you have pain, itching, or odor, helps narrow down what’s going on.
Yeast Infection
Vaginal yeast infections are the single most common reason for vulvar redness and swelling. The hallmark is thick, white discharge that looks like cottage cheese, along with intense itching or burning in and around the vagina. Some women also notice small cuts or tiny cracks in the vulvar skin, which happen because the inflamed tissue becomes fragile. Pain during sex is common with yeast infections, and symptoms often flare right before a period.
Yeast infections are caused by an overgrowth of fungus that normally lives in the vagina in small amounts. Antibiotics, hormonal changes, high blood sugar, and a weakened immune system can all tip the balance. Over-the-counter antifungal treatments work well for most cases, but if you’ve never had a confirmed yeast infection before, it’s worth getting checked rather than guessing.
Contact Dermatitis and Allergic Reactions
Sometimes the redness and swelling have nothing to do with infection. Vulvar dermatitis is an inflammatory reaction triggered by something that touched the skin. The list of potential irritants is long: soap, bubble bath, shampoo, laundry detergent, scented pads or panty liners, tampons, spermicides, synthetic underwear (especially nylon), douches, perfume, tea tree oil, and even toilet paper with dyes or fragrance.
This type of reaction can appear suddenly, even with products you’ve used for months, because repeated low-level exposure can eventually sensitize the skin. The swelling and redness typically improve within a few days once you stop using the offending product. If you recently switched soaps, detergents, or menstrual products, that’s a strong clue.
Bacterial Vaginosis
Bacterial vaginosis, or BV, is often confused with yeast infections, but the two look and feel quite different. BV produces a thin, grayish discharge that tends to be heavier in volume and has a noticeable fishy odor, especially after your period or after sex. While BV can cause some irritation, it typically does not cause significant pain, and the redness and swelling tend to be milder than what you’d see with a yeast infection. The odor is the distinguishing feature. BV requires a different treatment than yeast, so getting the right diagnosis matters.
Sexually Transmitted Infections
Two STIs in particular can cause noticeable vulvar redness and swelling.
Trichomoniasis is a parasitic infection that produces a frothy, yellowish-green discharge with a strong odor. About 22% to 37% of women with trichomoniasis develop visible redness or swelling of the vulva. Many cases are mild enough to go unnoticed, which is why it often spreads without either partner knowing.
Genital herpes looks different. The first outbreak usually starts 2 to 12 days after exposure with pain or itching, followed by small bumps or blisters that rupture into painful open sores. A primary outbreak often comes with flu-like symptoms: fever, headache, body aches, and swollen lymph nodes in the groin. The area around the sores can become significantly red and swollen. Recurrent outbreaks are usually shorter and less severe.
Bartholin’s Cyst or Abscess
The Bartholin’s glands sit on either side of the vaginal opening and produce lubricating fluid. When one of these glands gets blocked, fluid backs up and forms a cyst, which you’ll feel as a firm, round lump near the lower part of the labia. If the cyst becomes infected, it turns into an abscess: a painful, hot, swollen lump that can grow quickly over a day or two.
Small, painless Bartholin’s cysts sometimes resolve on their own with warm soaks. But if a lump is painful and doesn’t improve within two to three days of home care, if the pain is severe enough to interfere with walking or sitting, or if you develop a fever above 100.4°F, you need medical attention. An abscess may require drainage and possibly antibiotics.
Low Estrogen and Vaginal Atrophy
If you’re in perimenopause, postmenopause, or breastfeeding, declining estrogen levels can cause the vaginal lining to become thinner, drier, and chronically inflamed. This condition, called vaginal atrophy, makes the tissue more fragile and easily irritated. Classic signs include persistent dryness, redness, and swelling, along with burning during urination and discomfort during sex.
Without estrogen, the vagina also produces less of its normal lubricating fluid, and the natural acid balance shifts. Both changes leave the tissue more vulnerable to irritation and infection, which means you may notice recurring redness or soreness that never fully clears. Prescription estrogen therapy applied locally to the vaginal area is the most effective treatment.
How to Tell What You’re Dealing With
A few questions can help you sort through the possibilities before you see a provider:
- Thick, white, cottage-cheese discharge with itching: likely a yeast infection
- Thin, gray discharge with a fishy smell: likely BV
- Frothy, greenish discharge with odor: possible trichomoniasis
- Blisters or open sores with flu-like symptoms: possible herpes
- A single painful lump near the vaginal opening: possible Bartholin’s cyst or abscess
- Redness that appeared after using a new product: likely contact dermatitis
- Persistent dryness and thinning during or after menopause: likely vaginal atrophy
Easing Discomfort at Home
A sitz bath is one of the simplest ways to reduce vulvar swelling and pain. Fill a bathtub or a shallow basin with three to four inches of warm water (around 104°F) and soak for 15 to 20 minutes. Plain warm water works best. Epsom salt, oils, and other additives can actually increase inflammation, so skip them unless a provider specifically tells you to add something.
You can take sitz baths three to four times a day when symptoms are at their worst. Beyond that, avoid anything that might be adding to the irritation: switch to plain warm water for washing (a small amount of mild, unscented soap on the outer skin only), wear cotton underwear, and change out of sweaty workout clothes or wet swimsuits promptly.
Preventing Recurrent Irritation
The vulvar skin is thinner and more sensitive than skin on most other parts of your body, so it reacts to things that wouldn’t bother you elsewhere. A few practical habits make a real difference over time. Use fragrance-free laundry detergent and check the ingredient list for enzymes like amylase, lipase, and protease, which can irritate genital skin. Skip fabric softeners and dryer sheets. Avoid scented tampons, pads, sprays, and douches entirely.
When washing, use your fingers and warm (not hot) water. Scrubbing or using washcloths can cause microtears. Wipe front to back after urinating to prevent bacteria from migrating forward. And if you shave or wax the area, know that both methods are harsh on fragile genital skin and can trigger redness, ingrown hairs, and swelling on their own.