A hard lump on the vulva is most commonly a cyst, an ingrown hair that has become inflamed, or a blocked gland. The majority of vulvar lumps are benign and resolve on their own or with simple home care. That said, location, pain level, and how long the lump has been there all matter in narrowing down the cause.
Bartholin’s Cyst
The most well-known cause of a vulvar lump is a Bartholin’s cyst. The Bartholin’s glands sit on each side of the vaginal opening, and when one of their ducts gets blocked, fluid backs up and forms a cyst. You’ll feel it as a round lump near the lower part of the vaginal opening, almost always on just one side. Small Bartholin’s cysts can feel firm and painless, and you might only notice them by touch. Larger ones can become tender, especially if the trapped fluid gets infected and turns into an abscess.
An uninfected Bartholin’s cyst can sit there for weeks without causing much trouble. Once it becomes an abscess, though, the area swells rapidly, turns red, and becomes intensely painful within a day or two. Walking or sitting may hurt. Soaking in a warm sitz bath (about 104°F, for 15 to 20 minutes, three to four times a day) can encourage a small cyst to drain on its own. If it doesn’t improve within a few days or becomes very painful, a healthcare provider can drain it with a minor in-office procedure.
Ingrown Hairs and Folliculitis
If you shave, wax, or wear tight clothing, an ingrown hair is a very likely culprit. It starts as a small pimple-like bump around a hair follicle, but if the hair curls back into the skin or bacteria get into the follicle, the bump can harden into a painful, pea-sized nodule. People with curly hair are especially prone to this.
When a follicle infection goes deeper, it can become a boil (also called a furuncle), which appears suddenly as a painful, inflamed lump that feels firm to the touch before it softens and fills with pus. Most ingrown hairs and superficial boils resolve within one to two weeks. Warm compresses help bring them to a head. Resist the urge to squeeze or pop the lump, as this can push bacteria deeper and worsen the infection.
Epidermoid (Sebaceous) Cysts
These small, firm lumps form when skin cells get trapped beneath the surface and create a keratin-filled pocket. On the vulva, they’re typically white or yellow, less than 1 cm across, and painless unless they become irritated or infected. They feel like a small, smooth marble that moves slightly under the skin when you press on it. Most require no treatment and stay the same size for months or years. If one becomes red and tender, it may be infected and worth having a provider evaluate.
Skene’s Duct Cyst
Less commonly discussed, the Skene’s glands sit on either side of the urethral opening, near the top of the vaginal entrance. A blocked duct here creates a cyst that can feel like a firm bump at the front of the vulva, close to where you urinate. This location is the key difference from a Bartholin’s cyst, which sits lower and further back. Skene’s duct cysts are uncommon but sometimes get misidentified as urethral problems because of their location. They can cause discomfort during urination or a feeling of pressure.
Sexually Transmitted Causes
Two STIs can produce lumps that feel hard on the vulva.
A syphilis chancre is a small, round sore that appears about three weeks after exposure. What makes it distinctive is that it’s often completely painless, which is why many people don’t notice it. The base of the sore feels firm or rubbery. It heals on its own within three to six weeks, but this doesn’t mean the infection is gone. Syphilis progresses to more serious stages if untreated, so a painless, firm sore that appeared recently warrants STI testing.
Genital warts caused by HPV can show up as a single hard bump, though they more commonly appear in clusters. Their texture and shape vary widely: they can be flat, dome-shaped, or cauliflower-like, and range in color from skin-toned to white, pink, or brown. A solitary wart can sometimes feel like a firm, rough-surfaced papule. Unlike a cyst, warts sit on the skin’s surface rather than underneath it.
Signs That Need Prompt Attention
Most vulvar lumps are harmless, but certain features raise concern. A lump that keeps growing over weeks, doesn’t respond to warm compresses or home care, bleeds, or has an ulcerated surface should be evaluated. Vulvar cancer is rare, but it can present as a persistent, firm lump or thickened area, most often in women over 50. Any suspicious vulvar lesion can be evaluated with a simple punch biopsy, a quick in-office procedure that removes a tiny sample of tissue for examination.
You should also pay attention to systemic signs. Fever, chills, rapidly spreading redness, or swollen lymph nodes in the groin suggest an infection has moved beyond the skin’s surface. Recurrent vulvar abscesses that don’t respond well to drainage, especially in younger women, can occasionally be linked to inflammatory conditions like Crohn’s disease, particularly when they’re accompanied by fever that seems disproportionate to the size of the lump.
What a Provider Will Do
For most vulvar lumps, a physical exam is all that’s needed for diagnosis. The provider looks at the lump’s location, size, texture, and whether it moves under the skin. For deeper or more complex lumps, an ultrasound using a probe placed on the perineum is the typical first step. MRI is reserved for larger masses (generally over 2 cm) or when a tumor needs staging.
Many lumps require nothing more than monitoring or simple drainage. If there’s any concern about the appearance, a biopsy settles the question. The procedure takes minutes and uses local anesthesia.
Home Care for Minor Lumps
If your lump is small, recently appeared, and doesn’t have alarming features, a sitz bath is the most effective home remedy. Fill a bathtub or a plastic sitz bath basin with three to four inches of warm water (around 104°F) and soak for 15 to 20 minutes. Doing this three to four times a day can reduce swelling, ease pain, and encourage a cyst or boil to drain naturally. Pat the area dry afterward and avoid tight underwear or clothing that traps moisture. Loose cotton underwear and breathable fabrics reduce friction and help the skin heal.
Avoid shaving or waxing the area while a lump is present. If the lump hasn’t improved after a week of consistent warm soaks, has grown noticeably, or becomes significantly more painful, it’s time for a professional evaluation.