Tag: Surgical Care

Armpit Lump Causes: 4 Types and Warning Signs to Know

SummaryMistaking an armpit lump for a simple pimple and squeezing it or ignoring it can lead to much higher treatment costs down the road. Understanding the main armpit lump causes can help you catch problems early. Explore the 4 possible causes — sebaceous cysts, lymphadenitis, accessory breast tissue, and lipomas — along with their warning signs and proper treatment options.

While massaging your lymph nodes,
have you ever touched your armpit
and felt a hard lump underneath?

Brushing it off as "just a big pimple"
can sometimes lead to spiraling medical bills later.

That’s because an armpit lump isn’t always a simple pimple —
it can be a warning sign of a condition that needs treatment.

armpit lump causes

Key Takeaways
An armpit lump can have many different causes, including sebaceous cysts, lymphadenitis, accessory breast tissue, and lipomas.
It’s safest to monitor for pain and size changes and get an ultrasound exam for an accurate diagnosis.
Some cases resolve on their own depending on the cause, but leaving it unchecked can increase the scope and cost of treatment.

What Are the Main Armpit Lump Causes?

To answer the question directly, armpit lump causes generally fall into one of four main categories.
An armpit lump is a mass that forms in the skin or the tissue beneath it, and the right treatment depends entirely on its underlying cause.

A common cause is an epidermal cyst (sebaceous cyst), which forms when a hair follicle or sebaceous material builds up under the skin.
According to Asan Medical Center’s disease encyclopedia, epidermal cysts typically grow slowly to about 1 to 5 cm and sometimes show a small central opening (punctum).
Squeezing the cyst can release foul-smelling discharge, but doing so carelessly can worsen inflammation, so caution is needed.

armpit lump related image 2

The second cause is lymphadenitis (swollen lymph nodes), where the lymph nodes enlarge as part of an immune response.
When the body reacts to a cold, weakened immunity, or internal inflammation, the lymph nodes swell and can be felt as a firm lump.
Asan Medical Center describes lymphadenitis as "an immune response in which the lymph nodes enlarge due to infection or, less commonly, malignant tumors."

armpit lump related image 3

The third cause is accessory breast tissue, which occurs when mammary gland tissue remains in the armpit area.
It develops when the "milk line" tissue running from the chest to the armpit during fetal development doesn’t fully regress, and its size and pain level change with the menstrual cycle and hormonal shifts.
Finally, a soft, slow-growing, painless lipoma is another common cause.

Type	Characteristics	Pain
Epidermal/Sebaceous Cyst	Close to skin surface, may discharge fluid	Usually none
Lymphadenitis	Caused by immune response	Painful when pressed
Accessory Breast Tissue	Size fluctuates with menstrual cycle	Cyclical pain
Lipoma	Soft, slow-growing	None

Checklist
✅ Epidermal/Sebaceous cyst: Feels soft just beneath the skin and may discharge fluid
✅ Lymphadenitis: Occurs from an immune response and causes pain when pressed
✅ Accessory breast tissue: Residual mammary tissue that changes in pain and size with the menstrual cycle
✅ Lipoma: A soft, painless fatty lump that grows slowly

Is a Painless Armpit Lump Safe to Ignore?

No. In fact, a hard, painless lump deserves even more attention.
A warning sign isn’t judged by how much it hurts, but by changes in the lump’s size, firmness, and whether it’s fixed in place.

Warning Signs
⚠️ When it feels completely painless, hard, and fixed in place when touched
⚠️ When it gradually grows larger over time and nearby skin changes appear
⚠️ When fever, redness, or swelling around the armpit worsens

A normal lymph node is usually less than 1 cm in diameter, small, and moves freely.
When inflammation progresses, however, the lymph node adheres to surrounding tissue and becomes difficult to move.
If the size, firmness, or mobility changes, further testing should be considered.

Lymph node enlargement occurs when the lymph nodes are infected or inflamed, or in cases involving a pus-filled abscess or cancer.

The Korea Disease Control and Prevention Agency explains this through its National Health Information Portal, noting that localized lymph node enlargement accounts for 70 to 80 percent of all cases.
Among these, swelling in the neck’s cervical lymph nodes is common, with the armpit and groin also being frequent sites.

armpit lump related image 4

A painless lump is more likely to be a chronic cyst or lipoma, but in rare cases further testing is necessary.
That’s why confirming the diagnosis with an ultrasound exam is a safer choice than self-diagnosis.

How Does Treatment Differ by Cause?

Knowing the exact cause is key to reducing recurrence and complications.
Treatment for an armpit lump ranges from simple monitoring to surgical removal, depending entirely on the underlying condition.

Lymphadenitis: May improve with adequate rest and immune care alone; anti-inflammatory pain relievers or antibiotics may be prescribed if needed.

armpit lump related image 5

Sebaceous cyst (epidermal cyst): Avoid squeezing it by hand; having it surgically removed under local anesthesia, including the cyst wall, can lower the risk of recurrence.

armpit lump related image 6

Accessory breast tissue: Since hormones play a major role, periodic monitoring is the standard approach, and surgical removal of the glandular tissue may be considered if pain or discomfort significantly affects daily life.

Outcome
Identifying armpit lump causes accurately and managing them appropriately may help some cases avoid major surgery, depending on the underlying condition.
However, we recommend discussing the diagnosis and treatment plan with a medical professional before making any decisions.

If you’re concerned about a lump or wound on your skin — not just in the armpit — seeing a specialist is important.
Burn Treatment Specialists – [Ansan Open Surgery Hospital] Homepage has more information on surgical care.

Frequently Asked Questions

1. Is it okay to keep touching an armpit lump to check on it?
Answer: Bacteria on your hands can cause a secondary infection or worsen inflammation, so it’s best to avoid pressing on or repeatedly touching the lump.

2. If an armpit lump doesn’t hurt, is it fine to just leave it alone?
Answer: Even without pain, it could be a chronic cyst, lipoma, or another condition, so it’s safer to monitor any size changes and confirm the diagnosis with an ultrasound exam.

3. Why does my armpit lump only hurt during my period?

Answer: It’s likely accessory breast tissue responding to changes in female hormones. This tissue tends to temporarily swell and become painful in sync with the menstrual cycle, then subside afterward.

4. Which specialist should I see for an armpit lump?
Answer: Visiting a breast surgeon, general surgeon, or dermatologist allows for an accurate diagnosis using tools like ultrasound, along with guidance tailored to the cause.

armpit lump related image 7

References

· Korea Disease Control and Prevention Agency, "Lymph Node Enlargement," National Health Information Portal. Link
· Asan Medical Center, "Lymphadenitis," Disease Encyclopedia. Link
· Asan Medical Center, "Epidermal Cyst," Disease Encyclopedia. Link
· Health Kyunghyang, "[Accessory Breast Story] Accessory Breast Tissue Is a Real Medical Condition," 2023. Link

This article is provided for general health information purposes only and is not a substitute for individual diagnosis or treatment. If you have symptoms, please consult a medical professional.

October 6, 2026

Burn First Aid: 15-Minute Golden Window Explained

SummaryBurn first aid centers on cooling the area under running cool water for 15–20 minutes. Together with Ansan Yeollin Surgical Hospital near Gojan Station, let’s look at burn stages and how the clinic manages wound care.

Even a brief brush against hot soup or a hot iron can leave skin red and stinging within seconds.
In the panic of the moment, plenty of people reach first for ice, or apply home remedies like alcohol or toothpaste.

In reality, the golden window for burn first aid is just the first 15 minutes after the injury,
and how you use that time can make a real difference in whether a scar forms.

Burn first aid

This article covers the correct order of steps for burn first aid and the actions you should never take.

We’ll also explain how to tell first-, second-, and third-degree burns apart by symptom,
along with how Ansan Yeollin Surgical Hospital near Gojan Station approaches wound care.

Burn first aid illustration 2

What Should You Do Right After a Burn? Burn First Aid Steps

The first thing to do right after a burn is to cool the affected area under cool running water.
Burn first aid means the initial response that draws heat out of the skin and helps prevent secondary infection before the damage goes any deeper.

Remove the source of heat right away, then cool the area under running tap water at roughly 15–20°C (about 59–68°F).

Avoid placing ice or ice water directly on the skin.
Doing so can make blood vessels constrict suddenly, which may actually worsen tissue damage.

Burn first aid illustration 3

If hot liquid soaked through clothing, don’t force the fabric off.
Keep water running over it and ease it away slowly for safety.

The key is to keep cooling the area for about 15–20 minutes, until the burning sensation eases.

Burn first aid illustration 4

Key Points
1. Cool the area for 15–20 minutes under lukewarm or cool running water
2. Never place ice or an ice pack directly on the skin
3. If clothing sticks to the burn, don’t pull it off — soak it with water and ease it away
4. Keep the burned area raised above heart level to help reduce swelling

Precautions
⚠️ Do not apply home remedies such as alcohol, soybean paste, toothpaste, or aloe
⚠️ Do not apply petroleum jelly or other oil-based ointments while the area still feels hot
⚠️ Do not pop blisters with your hands

Burn first aid illustration 5

How Do You Tell Burn Degrees (1st, 2nd, 3rd) Apart?

Burns are classified from first- to third-degree based on how deep the skin damage goes.
Symptoms and the care needed differ significantly by degree, so telling them apart matters.

Burn first aid illustration 6

Type	Depth of Damage	Main Symptoms
First-degree burn	Epidermis (outer layer)	Redness, mild pain, no blistering
Second-degree burn	Dermis	Blistering, severe pain, infection risk
Third-degree burn	Subcutaneous fat layer	White or blackened skin discoloration, reduced pain sensation

First-degree burns affect only the outer layer of skin and tend to heal on their own within a few days, while blistering is the defining feature of second-degree burns.

Third-degree burns can damage nerves so severely that pain sensation may actually be reduced, which is why surgical evaluation is essential.

Burn first aid illustration 7

Checklist
✅ Is the skin red and still warm to the touch? (Possibly first-degree)
✅ Have blisters formed with clear or yellowish fluid? (Possibly second-degree)
✅ Is sensation reduced, or has the skin turned white? (Possibly third-degree)
✅ Is the face, hands, feet, a joint, or a large area affected? (Seek care immediately)

How Does the Hospital Treat Burn Wounds?

The goal of surgical treatment is to prevent secondary infection and help minimize scarring.
Wound care refers to the full process of disinfection, dressing, and maintaining a moist environment to support skin regeneration.

In the early stage, disinfection and specialized dressing materials help keep out contaminants, and if a blister is large, medical staff drain only the fluid using sterilized instruments.

Trying to do this at home on your own can sometimes make an infection worse.
Professional wound care, such as that offered near Gojan Station at Yeollin Surgical Hospital, is generally recommended for this reason.

Burn first aid illustration 8

After initial care, a customized moist foam dressing is applied to absorb fluid and protect the wound.

While the skin regenerates, ongoing disinfection and monitoring alongside it may help reduce the likelihood of scarring.

Burn first aid illustration 9

Key Points
1. Blisters act as a natural protective barrier — don’t pop them yourself
2. Keep water from getting directly on the dressed area
3. Avoid scratching, even if the healing skin feels itchy
4. Keep using sunscreen after treatment to help prevent discoloration

Scar Prevention and Choosing a Hospital: What to Check

Reducing the risk of scarring is generally understood to involve preventing early infection and maintaining a moist wound environment.
Even after the skin finishes regenerating, thorough sun protection for 3–6 months can help prevent discoloration.

Burn first aid illustration 12

Takeaways
· Proper initial cooling and disinfection may help reduce the risk of scarring
· Consistently maintaining a moist dressing may help support the pace of skin regeneration
· Keeping up sun protection after treatment can help prevent discoloration

If you have a second-degree burn or worse — one with blistering or skin discoloration — or a burn on the face, hands, feet, or a joint, you should see a doctor without delay.

Ansan Yeollin Surgical Hospital is located near Gojan Station (376 Hwarang-ro, Danwon-gu, Ansan-si, Gyeonggi-do) and also provides emergency care, allowing for prompt visits even in sudden situations.

Burn first aid illustration 13

If you’d like information on surgical conditions beyond burns,
check out the Burn Treatment Information, [Ansan Yeollin Surgical Hospital] Home page.

Burn first aid illustration 11

Frequently Asked Questions

1. Can I apply petroleum jelly or ointment to a burn right away?
Applying petroleum jelly or other oil-based ointments while the area is still hot can trap heat inside and make the wound deeper. Cool the burn first, then get professional disinfection and care.

2. Should I just leave a blister alone?
Small blisters protect the tissue underneath, so it’s best not to pop them. However, if a blister is large or very painful, it’s safer to have medical staff drain it with sterilized instruments.

3. What can I do to help prevent a burn scar?

It’s important to prevent early infection and keep the wound in a moist environment rather than letting it dry out. Even after healing, thorough sun protection for 3–6 months can help prevent discoloration.

4. When should I visit a hospital after first aid?
Second-degree burns or worse with blistering or skin discoloration, and burns on the face, hands, feet, or joints, need prompt surgical evaluation. Getting the wound checked early at a nearby facility, such as Yeollin Surgical Hospital near Gojan Station, is a good idea.

References

· Korea Disease Control and Prevention Agency, “Burns,” National Health Information Portal. View source (publication year to be confirmed)
· Asan Medical Center Newsroom, “Don’t Use Ice on a Burn,” Asan Medical Center. View source (publication year to be confirmed)

This article is intended for general health information purposes only and is not a substitute for individual diagnosis or treatment. If you have symptoms, please consult a physician.

September 16, 2026

Epidermoid Cyst: 3 Reasons Not to Squeeze the Pus Yourself

SummaryForcibly squeezing the pus out of an epidermoid cyst can rupture the cyst wall, leading to secondary infection and significant scarring. This guide covers what causes an epidermoid cyst, why you should never squeeze one yourself, how surgical excision works, and how to prevent recurrence.

Have you ever had a lump that started giving off an odor and causing pain over a few days, decided a doctor’s visit felt like overkill, assumed it was just a pimple, and squeezed it yourself?

In most cases, symptoms like this point to an epidermoid cyst — a small pocket that forms under the skin as dead skin cells build up.

Even if it looks like all the yellowish pus has drained out, the firm cyst sac usually remains intact beneath the skin.

Some people brush off a small bump on their body, squeeze it themselves, and end up with much worse swelling as a result.

Epidermoid cyst

Quick Preview
· An epidermoid cyst is a benign sac that forms when dead skin cells and keratin build up beneath the skin.
· When bacteria infect the cyst, it can fill with pus (an inflamed epidermoid cyst), causing pain and a foul odor.
· Squeezing it yourself can rupture the sac, leading to secondary infection and scarring — the inflammation needs to settle first, then the sac itself is generally removed through surgical excision, which may help reduce the chance of recurrence.

Epidermoid cyst illustration 2

What Is an Epidermoid Cyst?

An epidermoid cyst is a benign growth that forms when dead skin cells and waste material accumulate in a sac beneath the skin.

An epidermoid cyst develops when epidermal cells become trapped beneath the skin’s surface, forming a sac that gradually fills with keratin, a protein found in skin cells.

Skin normally goes through a constant cycle of shedding old cells and producing new ones.

When epidermal cells become lodged beneath the skin for some reason, a sac forms at that spot and keeps filling with dead skin material.

Epidermoid cyst illustration 3

Over time, as the sac grows and bacteria invade it, the cyst can fill with pus, causing severe pain and a strong odor.

This type of cyst doesn’t disappear on its own — as long as the sac wall remains, it tends to keep coming back.

Epidermoid cyst illustration 4

Key Point
Why does it keep coming back? Even after the contents are squeezed out, if the sac wall (the cyst membrane) itself remains, it will refill with dead skin cells and keratin and grow larger again.

What Are the Risks of Squeezing an Epidermoid Cyst Yourself?

Squeezing the pus out of an epidermoid cyst by hand carries a high risk of secondary infection and scarring.

Many people have mistaken it for a simple pimple, squeezed it hard, and watched it swell up almost immediately.

Even though yellowish pus appears to drain out, the firm cyst sac usually remains intact beneath the skin.

Epidermoid cyst illustration 5

Strong pressure from squeezing can rupture the sac, pushing the waste material deep into the surrounding skin tissue.

This can cause inflammation to spread rapidly, leaving nearby skin red and swollen, with worsening pain.

The result is often a longer treatment period due to secondary infection, and even after healing, noticeable scarring can remain.

According to sources such as Hidoc, cysts that form on the face are sometimes mistaken for acne and squeezed by hand, which can make the inflammation worse.

Checklist
✅ Check whether the area around the lump is red and feels warm to the touch
✅ Press gently to see if there’s a sharp pain along with pus or discharge
✅ Watch for the lump growing larger or developing an odor
✅ Never try to force it open with your fingernails or a needle

Epidermoid cyst illustration 6

Caution
Even if the lump temporarily shrinks after being squeezed, it can grow back over time if the sac remains. Don’t simply apply ointment on your own and leave it — keep monitoring your symptoms and seek care if they persist.

How Is an Epidermoid Cyst Treated?

The definitive treatment for this type of cyst is surgical excision, which removes the entire sac.

If the cyst is already full of pus and severely inflamed, surgery right away may not be possible.

In these cases, doctors typically start with antibiotics or partial drainage to calm the inflammation and reduce the pus first.

Epidermoid cyst illustration 7

Once the inflammation has settled sufficiently, the cyst wall and sac are cleanly excised.

Some people put off surgery out of concern about scarring.

However, having the cyst cleanly removed early on may help minimize scarring and lower the chance of recurrence.

Stage	Treatment
Stage 1: Managing inflammation	Antibiotics and partial drainage to relieve pain and reduce pus
Stage 2: Surgical excision	Complete removal of the cyst wall and sac under local anesthesia

What to Expect After Surgery
With proper medical guidance to control inflammation and fully remove the sac, patients may see a lower chance of recurrence and clearer-looking skin over time.

If you’re concerned about skin issues like an epidermoid cyst or about scar management, you can find more information on the home page of Ansan Yeollin Surgery Hospital, which also provides burn treatment information.

Frequently Asked Questions

1. Can an epidermoid cyst rupture and disappear on its own?
It may shrink temporarily as pus or discharge drains out, but in most cases the sac remains and the cyst grows back.

2. Is surgical excision painful?
The procedure is performed under local anesthesia, so patients generally feel relatively little pain during surgery.

3. Is there a way to prevent epidermoid cysts?
Keeping the skin clean and regularly managing dead skin buildup so pores stay clear can help.

4. If an epidermoid cyst fills with pus, can it be treated with surgery right away?
When inflammation is severe, immediate surgery is usually difficult. It’s common to first calm the inflammation with antibiotics before performing excision.

References

· Hidoc, “[Health Talk] A Lump on the Skin, the ‘Epidermoid Cyst’ — Is It Okay to Squeeze It Yourself?,” Hidoc, 2022. View source
· Medical Today, “Removing an Epidermoid Cyst: How to Treat It Without Recurrence?,” Medical Today, 2025. View source

This article is intended to provide general health information and is not a substitute for individual diagnosis or treatment. If you’re experiencing symptoms, please consult a physician.

August 22, 2026