Vaginal boils are almost always caused by a type of bacteria called Staphylococcus aureus (staph) that infects a hair follicle on the vulva. Staph lives naturally on your skin and inside your nose, where it’s harmless. It only causes problems when it enters through a tiny break in the skin, such as a nick from shaving, and reaches deeper tissue. Once inside, the body walls off the infection, creating a painful, pus-filled lump.
How Bacteria Get In
The vulvar area has hair follicles, moisture, and friction, all of which create opportunities for bacteria to enter the skin. The most common entry points are small cuts or micro-tears that you may not even notice. A razor nick, a pulled hair, or skin rubbed raw by tight clothing can be enough.
Once staph bacteria reach a damaged follicle, they multiply quickly. Your immune system responds by sending white blood cells to the area, which produces pus. The result is a firm, swollen bump that grows more painful as pressure builds inside it. Most boils start small and reach their peak over several days before they either drain on their own or need medical attention.
Shaving, Waxing, and Ingrown Hairs
Hair removal is the single most common trigger for boils in the vulvar area. Shaving creates tiny nicks in the skin that are invisible to the eye but large enough for bacteria to slip through. Waxing pulls hair forcefully from the follicle, leaving the opening temporarily vulnerable. Both methods also increase the risk of ingrown hairs, where a hair curls back into the skin instead of growing outward. That trapped hair irritates the follicle and creates an ideal setup for infection.
People with naturally curly hair are especially prone to ingrown hairs after shaving. The tighter the curl pattern, the more likely the hair tip is to re-enter the skin. These ingrown hairs can look and feel similar to boils on their own, but when bacteria join the picture, a full boil develops. If you notice boils repeatedly after grooming, the grooming method itself is likely the root cause.
Friction and Tight Clothing
Clothing that presses tightly against the vulva, especially during movement, creates constant friction that can damage hair follicles over time. Synthetic fabrics trap heat and moisture against the skin, giving bacteria a warm, damp environment to thrive in. Workout leggings, non-breathable underwear, and sitting for long periods in sweaty clothing all raise the risk. Switching to breathable, cotton-based fabrics and changing out of sweaty clothes promptly can make a noticeable difference.
Diabetes and Immune Function
People with diabetes develop vulvar boils and skin abscesses more frequently, and the reason is twofold. Diabetes changes the skin’s pH, making it more hospitable to staph and similar bacteria. At the same time, it weakens the immune response: white blood cells move more slowly to infection sites and are less effective at killing bacteria once they arrive. Blood vessel changes from diabetes further slow the immune response and impair wound healing.
When blood sugar is poorly controlled, these effects intensify. Boils may take longer to resolve, are more likely to worsen, and have a higher chance of recurring. Any condition that suppresses immune function, not just diabetes, can have a similar effect by reducing the body’s ability to contain a staph infection before it becomes a visible boil.
Boils That Keep Coming Back
An occasional boil is common and usually not a sign of anything deeper. But if you’re getting painful lumps in the groin, armpits, or under the breasts repeatedly over months or years, a condition called hidradenitis suppurativa (HS) may be responsible. HS produces deep-seated nodules, typically half a centimeter to two centimeters in size, that persist for days to months. These lumps are frequently mistaken for ordinary boils, and the diagnosis is delayed by an average of seven years because of that resemblance.
The key differences: HS nodules tend to recur in the same areas, rupture and drain repeatedly, and can form tunnels under the skin that connect multiple lumps. The discharge may have a strong odor. HS typically starts between puberty and young adulthood and follows a pattern of flare-ups and temporary improvement. If this sounds familiar, it’s worth raising with a dermatologist specifically, since many general practitioners may not recognize it immediately.
Boil vs. Bartholin’s Cyst
Not every lump near the vagina is a boil. Bartholin’s glands sit on either side of the vaginal opening and produce fluid that helps with lubrication. When a gland’s opening gets blocked, fluid backs up and forms a cyst. A small Bartholin’s cyst is painless and you might not even notice it. A larger one feels like a marble-sized lump on one side of the vaginal opening.
The location is the biggest clue. A boil can appear anywhere on the vulva where there are hair follicles. A Bartholin’s cyst appears specifically at the lower left or right of the vaginal opening, where the glands are located. If a Bartholin’s cyst becomes infected, it turns into an abscess with symptoms that overlap with a boil: pain, swelling, tenderness, and sometimes fever. But the position, deeper and closer to the vaginal canal itself, is distinct.
Boil vs. Herpes Sores
Genital herpes can look similar to a boil in its earliest stages, but the two conditions differ in several important ways. Herpes typically appears as a cluster of small, fluid-filled blisters rather than a single deep lump. Before the blisters show up, you’ll often feel tingling, itching, or burning in the area. The blisters break open within days, ooze, then crust over and scab like a small cut, usually healing within a week or so.
A boil, by contrast, is a single firm lump that grows larger and more painful over days, feels warm to the touch, and eventually develops a visible white or yellow center as pus collects. It doesn’t tingle beforehand, doesn’t cluster, and doesn’t scab the way herpes sores do. If you’re unsure which you’re dealing with, the number of bumps and the progression pattern are the most reliable ways to tell them apart before seeing a provider.
How Boils Are Treated
Most small boils resolve on their own with basic care at home. The standard approach is applying a warm, damp washcloth to the area for about 10 minutes at a time, several times a day. The heat increases blood flow, helps the body fight the infection, and encourages the boil to come to a head and drain naturally. Resist the urge to squeeze or pop it, which can push bacteria deeper into the tissue or spread the infection.
When a boil is large, very painful, or doesn’t improve after several days of warm compresses, a healthcare provider can drain it with a small incision. For boils in the genital area specifically, drainage is sometimes combined with antibiotics because the location makes it harder to drain completely. Topical antibiotics are often sufficient when only one or two small boils are present. Oral antibiotics become necessary when there are signs of spreading infection: fever, red streaks radiating from the boil, swollen lymph nodes, or surrounding skin that’s increasingly hot and red.
Reducing Your Risk
Since most vulvar boils trace back to bacteria entering through damaged skin, prevention centers on minimizing that damage. If you shave, use a sharp, clean razor and shave in the direction of hair growth rather than against it. Replace razors frequently. If boils keep recurring after shaving, consider trimming with scissors or clippers instead, which doesn’t break the skin surface.
Wearing breathable, cotton underwear helps keep the area dry and reduces friction. Changing out of sweaty workout clothes as soon as possible limits the time bacteria have to multiply in a warm, moist environment. Avoid sharing towels or razors, since staph transfers easily between people through shared items. If you have diabetes, maintaining stable blood sugar has a direct effect on how well your skin resists and recovers from these infections.