Vulvar swelling has several common causes, ranging from irritation by everyday products to infections and cysts. Most cases resolve on their own or with simple changes, but some need medical attention. Here’s what could be going on and how to tell the difference.
Irritation From Products You Use Every Day
The most common reason for vulvar swelling is contact with something that irritates the skin. The vulva is covered in thin, sensitive tissue, and it reacts to chemicals more easily than the skin on your arm or leg. Common culprits include scented soaps, bubble baths, laundry detergents, scented pads or panty liners, douches, vaginal sprays, spermicides, and even dyed or perfumed toilet paper. Shampoo and conditioner that runs down your body in the shower can also trigger a reaction.
This type of irritation, called contact dermatitis, can take a couple of weeks to a full month to clear up after you stop using the offending product. The tricky part is figuring out which product caused it, since you may have been using it for years without problems. If your swelling came on gradually and you recently switched soaps, detergents, or pads, that’s often the clue.
Synthetic underwear without a cotton crotch, sitting in a wet bathing suit for hours, and soaking in hot tub or pool water can also inflame vulvar tissue. Switching to unscented, dye-free products and cotton underwear is the simplest first step.
Yeast Infections and Bacterial Vaginosis
Fungal infections (yeast infections) are one of the most recognized causes of vulvar swelling. They typically bring thick, white, cottage cheese-like discharge along with intense itching and redness. The swelling happens because your immune system sends extra blood flow to the area to fight off the overgrowth of yeast.
Bacterial vaginosis (BV) is a different kind of infection caused by a shift in the natural balance of bacteria in the vagina. The hallmark signs are a thin, milky discharge with a fishy odor. BV doesn’t always cause noticeable swelling, but it can contribute to general irritation and puffiness. Unlike a yeast infection, BV requires prescription treatment since it won’t respond to over-the-counter antifungal creams.
If you’re not sure which one you’re dealing with, that’s normal. Even clinicians can’t always tell the difference by symptoms alone and rely on lab tests to confirm.
Sexually Transmitted Infections
Trichomoniasis, a common STI caused by a parasite, can produce symptoms that overlap with both yeast infections and BV. It may cause itching, burning, redness, and a clear, white, yellowish, or greenish discharge with a fishy smell. Symptoms range from mild irritation to severe inflammation. Genital herpes, another viral infection, can cause swelling along with painful blisters or sores.
The key difference with STIs is that they won’t clear up with home remedies or over-the-counter treatments. If swelling comes with unusual discharge, a strong odor, painful urination, or sores, getting tested is the fastest path to the right treatment.
Bartholin’s Cyst
If the swelling is concentrated on one side, near the opening of the vagina, it could be a Bartholin’s cyst. The Bartholin glands sit at roughly the 4 o’clock and 8 o’clock positions of the inner lips (labia minora). They’re normally pea-sized, rarely bigger than 1 cm, and you can’t feel them. But when one of their ducts gets blocked, fluid backs up and forms a cyst.
A small Bartholin’s cyst may cause only a painless lump. If it becomes infected and turns into an abscess, it can grow rapidly, becoming very tender, warm to the touch, and making it uncomfortable to sit or walk. Cysts smaller than 5 cm often resolve with warm soaks. Larger or recurring cysts, or any Bartholin’s lump in someone over 40, should be evaluated by a gynecologist.
Friction and Physical Activity
Sometimes the explanation is purely mechanical. Activities like cycling, horseback riding, prolonged walking, or vigorous sex can cause friction that leads to temporary swelling and soreness. The tissue becomes inflamed the same way skin on your hands might puff up after a blister forms. This kind of swelling is usually symmetrical, comes on within hours of the activity, and fades within a day or two with rest.
Wearing padded bike shorts, using lubrication during sex, and avoiding tight clothing can prevent friction-related swelling from recurring.
Swelling During Pregnancy
If you’re pregnant, vulvar swelling has a specific explanation. As blood volume increases and the growing uterus puts pressure on pelvic veins, blood flow from the vulvar area slows down. About 4% of pregnant women develop vulvar varicosities, which are essentially varicose veins on the vulva. They look like bluish, swollen bumps and can feel heavy or achy, especially after standing for a long time.
Vulvar varicosities almost always resolve on their own within weeks of delivery. Lying down with your hips slightly elevated, avoiding prolonged standing, and wearing supportive compression garments can ease discomfort in the meantime.
Hormonal Changes
A drop in estrogen, which happens during menopause, perimenopause, and sometimes while breastfeeding, can thin the vulvar skin and make it more vulnerable to irritation and swelling. The tissue loses some of its natural moisture and elasticity, so things that never bothered you before (a certain soap, sitting on a bike) can suddenly cause inflammation.
How to Ease Swelling at Home
For mild swelling without fever, open sores, or severe pain, a few practical steps can help:
- Sitz bath: Fill a shallow basin or bathtub with warm water (around 104°F or 40°C) and soak for 15 to 20 minutes. You can do this three to four times a day. No soap, no bubbles, just plain warm water.
- Eliminate irritants: Switch to fragrance-free soap, unscented laundry detergent, unscented white toilet paper, and cotton underwear. Stop using douches, sprays, or powders.
- Cold compress: A clean cloth wrapped around an ice pack and applied for 10 to 15 minutes can reduce acute swelling from friction or injury.
- Loose clothing: Tight jeans or leggings trap heat and moisture, making inflammation worse.
If swelling doesn’t improve within a few days, gets worse, or comes with fever, pus, spreading redness, painful urination, or unusual discharge, it’s worth getting a proper evaluation. Many of the conditions behind vulvar swelling are straightforward to treat once correctly identified.