Painful bump on the buttock: boil or folliculitis? How to identify and relieve it

A red, warm, swollen, and very painful bump on the buttock is almost never acne. In the vast majority of cases, it is a boil: a deep bacterial infection of the hair follicle caused by Staphylococcus aureus. The area, which is slightly...

Published on August 25, 2026 · Updated on September 22, 2026

Painful bump on the buttock: boil or folliculitis? How to identify and relieve it

A red, warm, swollen, and very painful bump on the buttock is almost never acne. In the vast majority of cases, it’s a boil: a deep bacterial infection of the hair follicle caused by Staphylococcus aureus. This area, which is not prone to acne but is highly exposed to friction, is an ideal breeding ground. The pain comes from the pressure of the pus trapped under the skin.

The right approach consists of three steps—do not lance it, apply a warm compress, use a topical antiseptic—and see a doctor if the infection worsens. Once the flare-up has passed, using a purifying body care product as part of your routine can help prevent recurrences. Here’s how to recognize a boil, relieve it, and keep it from coming back.

Key Takeaways

A painful bump on the buttock is most often a boil, a deep infection of a hair follicle.
The pain is caused by pressure from the pus; it subsides suddenly when the pus is drained.
Never pierce it: piercing it will make the infection worse and leave a scar.
The right steps to take: a warm compress, a topical antiseptic, gentle cleansing, and cotton clothing.
Fever, spreading redness, a lesion larger than 2 cm, recurrent episodes, or a compromised immune system → see a doctor.

Recognizing a buttock boil

A simple boil always goes through the same stages over a period of five to ten days:

Appearance: a small, red, warm bump centered at the base of a hair, sensitive to even the slightest touch.
Inflammation: The lesion enlarges into a hard pustule. The pain becomes throbbing and is aggravated by sitting.
Maturation: A white spot appears at the tip—the pustule, a collection of pus and necrotic tissue.
Drainage: The boil bursts on its own, the pus drains out, and the pain subsides. A red mark then fades; a permanent scar only appears if the boil has been lanced.

If several boils merge into a deep lesion, it is called anthrax; if they keep coming back, it is called furunculosis. Both conditions require medical treatment.

Why does this bump hurt so much?

The hair follicle is a narrow cavity formed in the deep layers of the skin. When bacteria settle there, the immune response sends white blood cells to the site: pus builds up in a space that cannot expand. This pressure on the nerve endings causes pain, and the pain increases until the lesion is drained. The buttocks area is subject to a number of aggravating factors—friction, heat, sweat, and sitting—a mechanical effect detailed in the causes of pimples on the buttocks.

Boil, abscess, pilonidal cyst, or something else?

Not all painful lesions on the buttocks are the same, and the appropriate course of action varies:

Simple folliculitis: several superficial red bumps that are not very painful, sometimes caused by a fungal infection. Benign.
An abscess: a larger, deeper collection of pus, often accompanied by a fever. It requires an incision by a doctor.
Pilonidal cyst: located in the gluteal cleft, associated with hair trapped under the skin. Since it tends to recur, it requires surgery—it should never be treated as a pimple.
Verneuil's disease: recurrent, painful nodules in skin folds; should be evaluated by a dermatologist.
Ingrown hair: painful but superficial; it clears up within a few days (see ingrown hairs).

When it comes to painless bumps, it's a different story: rough and dry, they resemble keratosis pilaris; with comedones and blackheads, they resemble body acne, such as back acne.

Causes and Risk Factors

Friction from tight clothing and sitting, which weaken the hydrolipidic film.
Sweat and moisture buildup (a wet shirt, sports clothes left on), where bacteria thrive.
Carriage of Staphylococcus aureus (in the nostrils, skin folds), which causes many cases of recurrent furunculosis.
Hair removal and shaving, which create an entry point at the hair root.
Weakened immune system (diabetes, immunosuppressive treatment): higher risk of complications; seek medical attention early.
Improper hygiene: too little encourages bacterial growth, while too aggressive a routine strips away the skin's protective barrier.

What to Do (and, Most Importantly, What Not to Do)?

Never lance it: squeezing pushes the bacteria deeper and turns a simple boil into an abscess.
A warm compress with hot water, for ten minutes, three to four times a day: the most effective way to soothe and speed up drainage.
Clean morning and night with mild, fragrance-free soap, then pat dry.
Apply a topical antiseptic to the wound and cover it with a bandage to prevent contamination.
Hand hygiene before and after, no sharing of towels or gloves, underwear changed daily, and linens washed at 60 °C.
Loose-fitting cotton clothing and as little time as possible spent sitting on the affected area.
Do not apply salicylic acid, exfoliants, or essential oils to an open or infected wound: these active ingredients are intended for preventive use only, once the inflammation has subsided.

Medical Treatment and When to Seek Care

A simple boil often does not require any medication: local treatment is sufficient. A doctor intervenes when the condition takes a turn for the worse: incision and drainage under local anesthesia if pus has accumulated; topical or oral antibiotics in cases of fever, carbunculus, or a compromised immune system; staphylococcal decolonization in cases of furunculosis; and, in some cases, laser hair removal for recurrent folliculitis. None of these treatments should be attempted without medical supervision.

Seek medical attention immediately if the pain is severe, if you have a fever, if the redness is spreading, if the lesion is larger than two centimeters, if outbreaks recur, or if you have diabetes or a weakened immune system. If you have a painful bump in the genital area or the intergluteal cleft, seeking medical advice is the only right option.

Preventing Recurrence

Once the crisis has passed, certain habits can help prevent relapses—sometimes the only real long-term treatment:

Cotton and breathable fabrics; avoid tight-fitting clothes in your daily life.
Shower and change immediately after exercising, swimming, or taking a bath.
Gentle daily cleansing and moisturizing to maintain the skin barrier.
Gently exfoliate once a week—when you don't have a breakout—to prevent clogged pores.
Do not wax an area where hair is growing; gently exfoliate two days before your next session.

As part of your skincare routine, a body treatment for blemishes like Fesse Time (lactic acid) can also be used on the back and arms, starting at age 3. The complete routine is detailed in the guide on how to get rid of pimples on the buttocks.

FAQ

How can you tell if you have a boil?

A red, hot, and painful bump centered around a hair follicle, which grows larger within a few days and then develops a white spot at the top. The most reliable sign: pain that is disproportionate to its size. If it exceeds two centimeters in size or is accompanied by swollen lymph nodes, it is more likely an abscess.

Can you pop a boil yourself?

No, never. Squeezing pushes the bacteria deeper into the skin and into the bloodstream, worsens the infection, and leaves a scar. If the lesion is ready to burst and doesn’t open on its own, a doctor should make an incision under local anesthesia.

Should you apply heat or cold to a sore pimple?

Heat. A warm compress, applied for ten minutes three to four times a day, helps the pus to collect and speeds up drainage. Cold only soothes the burning sensation; it is useful for simple irritation or redness after hair removal.

Is a boil contagious?

The boil itself is not contagious, but the Staphylococcus aureus bacteria that causes it is: it spreads through contact, via the hands, and through shared clothing. That’s why it’s important to cover the lesion, wash your hands, and avoid sharing anything. You can also spread the infection to another area of your body.

How long does a painful pimple on the buttock last?

A simple boil typically resolves within five to ten days, with spontaneous drainage that relieves the pain. The red mark takes two to four weeks to fade. A lesion that persists for more than two weeks is likely not a boil: a sebaceous cyst, pilonidal cyst, or Verneuil's nodule should be considered.

A painful bump on my buttock with no whitehead—what is it?

A hard, deep lump without a white head is often a boil in the inflammatory stage: the head has not yet formed. Apply warm compresses, avoid applying pressure, and monitor the area. If it does not come to a head within a week or recurs in the same spot, have a dermatologist examine it.

How can you prevent painful pimples on your buttocks?

Gentle daily hygiene, cotton underwear, changing clothes after exercise, weekly exfoliation (when not experiencing a flare-up), and moisturizing. If you have furunculosis, your laundry is just as important as your skin: change clothes daily, wash at 60 °C, and use your own towel.

What now?