A vaginal boil is a painful, pus-filled bump that forms under the skin near the vulva or vaginal opening. It develops when bacteria, most commonly Staphylococcus aureus, infect a hair follicle or oil gland in the area. Most vaginal boils are harmless and resolve on their own within one to two weeks, but some grow large enough to need medical drainage.
Despite the name, these boils almost always appear on the outer skin of the vulva rather than inside the vaginal canal. The medical term is a furuncle, and it’s essentially the same thing as a boil anywhere else on the body, just in a location that makes sitting, walking, and wearing clothes particularly uncomfortable.
What Causes Vaginal Boils
Bacteria enter through tiny breaks in the skin, whether from shaving nicks, friction, or ingrown hairs. Once inside a hair follicle, the bacteria multiply and the body sends white blood cells to fight the infection, creating the characteristic pocket of pus. The vulvar area is especially prone to this because it combines warmth, moisture, friction from clothing, and frequent hair removal.
Common triggers include:
- Shaving or waxing: Both methods damage hair follicles and create micro-tears in the skin where bacteria can enter.
- Tight clothing: Fabrics that trap heat and sweat against the skin create an ideal environment for bacterial growth.
- Friction: Repeated rubbing from underwear seams, exercise, or sitting for long periods can irritate follicles.
- Sharing personal items: Razors, towels, and washcloths can transfer bacteria between people.
People with diabetes or weakened immune systems are more susceptible to boils because their bodies have a harder time fighting off bacterial infections at the skin level.
What a Vaginal Boil Looks and Feels Like
A boil typically starts as a small, red, tender area that feels like a hard lump under the skin. Over several days it grows, becoming more painful and filling with pus until a visible white or yellow head forms at the center. The surrounding skin often looks swollen and inflamed. At its peak, even light pressure from sitting or walking can cause sharp pain.
Most boils range from pea-sized to marble-sized, though some grow larger. Once the boil drains, either on its own or with treatment, the pain drops dramatically. The area then gradually heals over the following days.
Boils vs. Bartholin’s Cysts
A lump near the vaginal opening isn’t always a boil. Bartholin’s glands sit on each side of the vaginal opening and produce fluid that helps with lubrication. When one of these glands gets blocked, fluid backs up and forms a cyst. An uninfected Bartholin’s cyst is usually painless, and you might only notice it as a soft lump on one side of the vaginal opening.
If that cyst becomes infected, though, it turns into a Bartholin’s abscess, which looks and feels a lot like a boil: tender, swollen, painful during walking or sitting, and sometimes accompanied by fever. The key difference is location. A Bartholin’s abscess occurs specifically at the lower left or right side of the vaginal opening, while a boil from an infected hair follicle can appear anywhere on the vulva where hair grows. Bartholin’s abscesses also appear on only one side at a time.
How to Tell It’s Not an STI
Finding an unexpected bump in the genital area can raise concerns about sexually transmitted infections, but boils look and behave differently from STI-related sores.
Herpes outbreaks produce multiple small, shallow blisters that break open into painful ulcers, often in clusters. A boil is a single, deeper lump with a firm feel. Syphilis sores (chancres) are typically painless, which is the opposite of a boil’s hallmark tenderness. A chancre also presents as an open ulcer with firm, raised edges rather than a closed, pus-filled bump.
That said, if you’re unsure what you’re looking at, or if the bump doesn’t follow the typical boil pattern of forming a head and draining within a couple of weeks, getting it checked is reasonable.
Home Treatment
Most vaginal boils don’t need medical intervention. The most effective home treatment is a warm compress: soak a clean washcloth in warm water and hold it against the boil for about 10 minutes at a time, several times a day. The heat increases blood flow to the area and encourages the boil to form a head and drain naturally. Many boils resolve within one to two weeks with this approach alone.
A few important rules: never squeeze or pop a boil. Forcing it open can push bacteria deeper into the tissue or spread the infection to surrounding skin. Keep the area clean, wear loose-fitting underwear made from breathable fabric, and avoid shaving near the boil until it has fully healed. If the boil drains on its own, gently clean the area and cover it with a loose bandage to prevent reinfection.
When a Boil Needs Medical Attention
Most boils are a nuisance, not a danger. But certain signs suggest the infection is spreading or needs professional drainage:
- Size: The boil grows large, doesn’t form a head, or becomes extremely painful.
- Duration: It hasn’t improved after two weeks or after several days of warm compresses.
- Fever or swollen lymph nodes: These indicate the infection may be moving beyond the skin.
- Spreading redness: A rapidly expanding area of red, warm skin around the boil can signal cellulitis, a skin infection that needs prompt treatment.
- Recurrence: Getting boils repeatedly in the same area warrants evaluation.
A rapidly changing or spreading rash with fever is a reason to seek emergency care rather than waiting for a scheduled appointment.
What Happens During Professional Drainage
When a boil is too large or deep to drain on its own, a provider performs an incision and drainage. After numbing the area with a local anesthetic, they make a small cut to release the pus. Relief is almost immediate once the pressure is gone. For Bartholin’s abscesses specifically, a small catheter may be placed in the opening for three to six weeks to keep the drainage tract open and prevent the abscess from refilling.
Antibiotics aren’t always necessary for a straightforward boil. They’re typically reserved for cases where the infection has spread to surrounding tissue, you have a fever, or you have an underlying condition that makes infections harder to fight.
Recurrent Boils and Hidradenitis Suppurativa
A single boil is common and usually not a sign of anything deeper. Recurrent boils in the groin, vulvar area, or underarms, however, can sometimes indicate hidradenitis suppurativa, a chronic inflammatory skin condition. This condition is often mistaken for acne or recurring infections because the lumps look similar.
There’s no lab test that diagnoses hidradenitis suppurativa. Providers evaluate it based on the pattern: Do the lumps keep returning in the same spots? Did they start in adolescence or early adulthood? Is there a family history? If your boils come back repeatedly, especially in the same locations or on both sides of the groin, it’s worth raising these questions with a provider. Hidradenitis suppurativa is a distinct condition with its own treatment approaches, and getting the right diagnosis can change how it’s managed long-term.
Reducing Your Risk
You can’t eliminate the risk entirely, but a few changes lower the odds significantly. If you shave the bikini area, wash the skin with warm water and a mild cleanser beforehand, shave in the direction of hair growth, use a clean sharp blade, and avoid going over the same patch more than twice. Applying shaving lotion before and moisturizer after helps protect the skin. An electric razor or guarded blade reduces the chance of nicking the skin compared to a bare razor.
Beyond shaving, switch to breathable cotton underwear, change out of sweaty workout clothes promptly, and avoid sharing razors or towels. If shaving consistently causes problems, consider alternatives like trimming with scissors or clippers, which don’t cut below the skin’s surface and carry much less risk of follicle damage.