A painful bump on the labia minora is most often caused by a blocked gland, an irritated hair follicle, or a small cyst. These are common, and most resolve on their own or with simple home care. Less frequently, a painful bump can signal an infection that needs treatment. Understanding what different bumps look and feel like can help you figure out what you’re dealing with.
Bartholin’s Cyst or Abscess
The Bartholin’s glands sit on either side of the vaginal opening, near the base of the labia minora. Their job is to produce fluid that helps with lubrication. When one of these glands gets blocked, fluid backs up and forms a cyst. A small Bartholin’s cyst may not hurt at all and you might not even notice it. But if the cyst grows or becomes infected, it turns into an abscess: a tender, painful lump near the vaginal opening that can make walking, sitting, or having sex uncomfortable. A fever sometimes accompanies an infected cyst.
Bartholin’s cysts are one of the most common causes of a noticeable bump in this area, particularly in women of reproductive age. Small, painless ones often resolve without any intervention. An abscess, however, typically needs to be drained by a healthcare provider. Warm compresses or sitz baths can help with discomfort in the meantime.
Folliculitis and Ingrown Hairs
The labia minora and surrounding vulvar skin have hair follicles, and those follicles can become irritated or infected. Folliculitis shows up as red, irritated bumps, sometimes with visible pus at the center. It’s especially common in areas with friction and sweating, which makes the vulva a frequent site. Shaving, waxing, and tight clothing all increase the risk.
An ingrown hair looks similar: a red, tender bump where a hair has curled back into the skin instead of growing outward. If a follicle infection deepens, it can become a boil, which feels like a warm, painful lump with pus collecting at its center. Most cases of mild folliculitis and small boils heal without treatment. Applying a warm compress several times a day helps draw the infection out and speeds things along. Avoid squeezing or popping the bump, which can push bacteria deeper into the skin.
Sebaceous Cysts
Sebaceous cysts form when oil-producing glands in the vulvar skin become blocked. The trapped material builds up into a lump filled with a yellow-white, greasy substance. These cysts are usually painless and movable under the skin, but they can become tender and swollen if they get infected. An infected sebaceous cyst may look red and feel warm to the touch.
Uninfected sebaceous cysts don’t require treatment and may stay the same size for a long time. If one becomes painful or keeps recurring, a provider can remove it. Don’t try to pop or drain a sebaceous cyst yourself, as this increases the chance of infection.
Herpes Outbreak
Genital herpes can cause painful bumps on the labia minora, though their appearance is distinct from cysts or folliculitis. A herpes outbreak often begins with a warning phase: burning, itching, or tingling at the site where the virus entered the body. Pain can also radiate to the lower back, buttocks, or thighs. Within a few hours, small fluid-filled blisters appear. Over the following days, these blisters break open, release fluid, and eventually crust over and heal without scarring.
A first outbreak tends to be more painful and last longer than recurrent ones. If you notice clusters of small blisters rather than a single firm lump, herpes is worth considering. Antiviral medication can shorten outbreaks and reduce their frequency, so getting tested matters even if the sores seem to be healing on their own.
Contact Dermatitis
Sometimes the bump or swelling isn’t from an internal cause at all. Vulvar dermatitis happens when the skin of your vulva reacts to something it has touched. Common triggers include soap, bubble bath, scented pads or panty liners, laundry detergent, synthetic underwear, douches, spermicides, and even toilet paper. The reaction can cause localized swelling, redness, and pain that might feel like a bump.
If the painful area appeared shortly after you switched products or used something new, irritation is a likely culprit. Removing the offending product and switching to fragrance-free alternatives usually resolves the problem within a few days. Wearing cotton underwear and avoiding harsh cleansers on the vulva can prevent recurrence.
Less Common Causes
A primary syphilis infection produces a sore called a chancre at the site of contact. Chancres are usually firm, round, and painless, which means most people don’t notice them. However, the CDC notes they are “not always” painless, so a syphilis sore can occasionally cause discomfort. Chancres appear roughly three weeks after exposure and heal on their own, but the infection progresses silently without treatment. If you’ve had a new sexual partner and develop an unusual sore, STI testing is worthwhile.
Vulvar cancer is rare, especially in younger women, but it can present as a lump, a wart-like bump, or an open sore on the vulva. Other signs include persistent itching that doesn’t go away, bleeding unrelated to your period, and visible changes in the color or thickness of the skin. A bump that doesn’t heal within a few weeks, or that keeps growing, warrants a medical evaluation.
Home Care That Helps
For most non-urgent bumps, a sitz bath is the simplest and most effective first step. Fill a clean basin or shallow tub with warm water at about 104°F (40°C) and soak for 15 to 20 minutes. You can do this three to four times a day when pain or swelling is at its worst. Sitz baths help reduce inflammation, encourage drainage of blocked glands, and relieve discomfort from folliculitis or small abscesses.
Beyond sitz baths, keep the area clean with plain warm water. Avoid scrubbing, and skip fragranced soaps or wipes. Wear loose-fitting cotton underwear to reduce friction. Over-the-counter pain relievers can help with tenderness. If you shave or wax the area, give it a break until the bump resolves.
Signs That Need Medical Attention
Most painful bumps on the labia minora are benign and temporary. But certain features suggest you should see a provider sooner rather than later:
- Rapid growth or increasing pain over a day or two, which may indicate an abscess forming
- Fever, especially alongside a swollen, warm lump
- Pus or foul-smelling discharge from the bump
- Recurrent blisters or sores that could point to herpes or another STI
- A bump that persists for more than two weeks without improving
- Bleeding from the bump that isn’t related to your period
- Changes in skin color or texture around the area
A gynecologist can often diagnose the cause with a visual exam. In some cases, they may swab the area for cultures or order blood work to check for infections. If a cyst or abscess needs draining, the procedure is straightforward and provides quick relief.