Hard Lump in The Armpit Symptoms, Causes & Common Questions

Understand your hard lump in the armpit symptoms, including 10 causes and common questions.

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Contents

  1. 10 Possible Hard Lump In The Armpit Causes
  2. Questions Your Doctor May Ask
  3. Statistics
  4. Related Articles

10 Possible Hard Lump In The Armpit Causes

The list below shows results from the use of our quiz by Buoy users who experienced hard lump in the armpit. This list does not constitute medical advice and may not accurately represent what you have.

Skin cyst

A cyst is a small sac or lump, filled with fluid, air, fat, or other material, that begins to grow somewhere in the body for no apparent reason. A skin cyst is one that forms just beneath the skin.

It's believed that skin cysts form around trapped keratin cells – the cells that form the relatively tough outer layer of the skin.

These cysts are not contagious.

Anyone can get a skin cyst, but they are most common in those who are over age 18, have acne, or have injured the skin.

Symptoms include the appearance of a small, rounded lump under the skin. Cysts are normally painless unless infected, when they will be reddened and sore and contain pus.

Diagnosis is made through physical examination. A small cyst can be left alone, though if it is unsightly or large enough to interfere with movement it can be removed in a simple procedure done in a doctor's office. An infected cyst must be treated so that the infection does not spread.

Rarity: Common

Top Symptoms: skin-colored armpit bump, marble sized armpit lump, small armpit lump

Symptoms that always occur with skin cyst: skin-colored armpit bump

Urgency: Wait and watch

Pimple

Pimples are also called comedones, spots, blemishes, or "zits." Medically, they are small skin eruptions filled with oil, dead skin cells, and bacteria.

Pimples often first start appearing at puberty, when hormones increase the production of oil in the skin and sometimes clog the pores.

Most susceptible are teenagers from about ages 13 to 17.

Symptoms include blocked pores that may appear flat and black on the surface, because the oil darkens when exposed to the air; blocked pores that appear white on the surface because they have closed over with dead skin cells; or swollen, yellow-white, pus-filled blisters surrounded by reddened skin.

Outbreaks of pimples on the skin can interfere with quality of life, making the person self-conscious about their appearance and causing pain and discomfort in the skin. A medical provider can help to manage the condition, sometimes through referral to a dermatologist.

Diagnosis is made through physical examination.

Treatment involves improving diet; keeping the skin, hair, washcloths, and towels very clean; and using over-the-counter acne remedies.

Rarity: Common

Top Symptoms: pink or red facial bump, small facial lump, painful facial bump, marble sized facial lump

Symptoms that always occur with pimple: pink or red facial bump

Urgency: Self-treatment

Skin abscess

A skin abscess is a large pocket of pus that has formed just beneath the skin. It is caused by bacteria getting under the skin, usually through a small cut or scratch, and beginning to multiply. The body fights the invasion with white blood cells, which kill some of the infected tissue but form pus within the cavity that remains.

Symptoms include a large, red, swollen, painful lump of pus anywhere on the body beneath the skin. There may be fever, chills, and body aches from the infection.

If not treated, there is the risk of an abscess enlarging, spreading, and causing serious illness.

Diagnosis is made through physical examination.

A small abscess may heal on its own, through the body's immune system. But some will need to be drained or lanced in a medical provider's office so that the pus can be cleaned out. Antibiotics are usually prescribed.

Keeping the skin clean, and using only clean clothes and towels, will help to make sure that the abscess does not recur.

Rarity: Common

Top Symptoms: rash with bumps or blisters, red rash, red skin bump larger than 1/2 cm in diameter, pus-filled rash, rash

Symptoms that always occur with skin abscess: rash with bumps or blisters

Urgency: Primary care doctor

Boil (furuncle)

A furuncle, also called a boil, is infection of a hair follicle. The infection forms under the skin at the root of the hair and may occur anywhere on the body.

The infection is caused by bacteria, most often Staphylococcus aureus or "staph." Irritation caused by clothes or anything else rubbing the skin can cause the skin to break down and allow bacteria to enter.

Staph bacteria are found everywhere. Frequent and thorough handwashing, and otherwise maintaining cleanliness, will help to prevent its spread.

Most susceptible are those with a weakened immune system; diabetes; and other skin infections.

Symptoms include a single bump under the skin that is swollen, painful, and red, and contains pus.

It is important to treat the boil, since infection can spread into the bloodstream and travel throughout the body.

Diagnosis is made through physical examination and sometimes fluid sample from the boil.

Treatment may involve incision and drainage of the infection, followed by creams to apply to the site of the boil and/or a course of antibiotic medicine.

Rarity: Uncommon

Top Symptoms: pink or red facial bump, small facial lump, painful facial bump, marble sized facial lump, constant skin changes

Symptoms that always occur with boil (furuncle): pink or red facial bump

Symptoms that never occur with boil (furuncle): fever

Urgency: Self-treatment

Non-hodgkin lymphoma

Lymphoma is a type of cancer that results from the malignant proliferation of white blood cells. White blood cells are a part of our bodies’ immune system and are important for fighting infection. Lymphomas are sub-classified as Hodgkin or non-Hodgkin lymphomas. These subtypes...

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Hard Lump In The Armpit Symptom Checker

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Folliculitis

Folliculitis is a common skin problem where hair follicles are infected by bacteria or fungi.

Rarity: Common

Top Symptoms: small facial lump, pink or red facial bump, face itch, facial bump leaking yellow/milky fluid, yellow or white facial bump

Symptoms that always occur with folliculitis: small facial lump

Urgency: Self-treatment

Severe skin abscess in the armpit

A skin abscess is an infection of the deeper skin that's typically due to bacteria seen on the skin. Recently, infections are more frequently caused by Staph. Aureus (puts the "staph" in "staph infections"). If the infection begins to spread, urgent treatment is required.

Rarity: Rare

Top Symptoms: fatigue, fever, painful armpit lump, pink or red armpit bump, marble sized armpit lump

Symptoms that always occur with severe skin abscess in the armpit: pink or red armpit bump, red bump

Urgency: Hospital emergency room

Hodgkin's lymphoma

Hodgkin lymphoma, formerly known as Hodgkin's lymphoma or Hodgkin's disease, is cancer of the lymphatic system. It is believed to be caused by a mutation in one of the body's immune system cells, called a B cell.

Most susceptible are those under age 30 or over age 55, with a family history of the disease, as well as anyone with a history of any illness caused by the Epstein-Barr virus.

Symptoms include swelling of lymph nodes in groin, armpits, and neck; lowered tolerance to drinking alcohol, including pain in lymph nodes afterwards; unintended weight loss; fever; chills; night sweats; and itching.

There are good treatments available for Hodgkin lymphoma, so it is important to see a medical provider about these symptoms as soon as possible.

Diagnosis is made through physical examination; blood tests; imaging such as x-ray, CT scan, or PET scan; and sometimes lymph node biopsy and/or bone marrow sample.

Treatment involves a combination of chemotherapy and radiation therapy. Bone marrow transplant, also called stem cell transplant, can be done in some cases.

Rarity: Rare

Top Symptoms: fatigue, loss of appetite, abdominal pain (stomach ache), shortness of breath, fever

Symptoms that never occur with hodgkin's lymphoma: pulsing armpit mass, armpit lump that comes and goes, shrinking armpit lump, pink or red armpit bump, black or brown armpit bump, yellow or white armpit bump, bleeding armpit bump, armpit bump leaking yellow or milky fluid, armpit bump leaking clear fluid, scabbed armpit bump, scaly armpit bump, neck lump that comes and goes, shrinking neck bump, pink or red neck bump, black or brown neck bump, yellow or white neck bump, bleeding bump, bump leaking clear fluid, neck bump leaking yellow/milky fluid, scabbed bump, scaly neck bump, pulsing chest mass, chest lump that comes and goes, shrinking chest bump, pink or red chest bump, black or brown mass on chest, yellow or white chest bump, blue bump on the chest, bleeding chest bump, chest bump leaking clear fluid, chest bump leaking yellow/milky fluid, scabbed chest bump, scaly chest bump, pulsing groin mass, groin lump that comes and goes, shrinking groin lump, pink or red groin bump, black or brown groin bump, yellow or white groin bump, inflamed groin bump, scaly groin bump, bleeding groin bump, groin bump producing clear fluid, groin bump producing yellow or milky fluid

Urgency: Primary care doctor

Wart

Warts, also called common warts or verrucae, are small, rough, rounded growths on the top layer of the skin. They may appear alone or in clusters. Common warts are caused by the human papillomavirus (HPV) and are contagious through direct contact. They may spread from one place on the body to another simply through touch.

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Breast cancer

There are several types of breast cancer, depending on the part of the breast where it starts. The most common types are ductal carcinoma in situ (DCIS), invasive ductal carcinoma and invasive lobular carcinoma.

Women over age 50 with a family history of the disease, and/or certain genetic factors, are most at risk, but anyone can get breast cancer at any age. It is rare in men but does occur.

Symptoms include a lump, thickening, or pain anywhere in the breast or armpit; red, flaky, or irritated breast or nipple skin; nipple discharge; and any area of irregular skin or misshapenness.

Many harmless conditions can cause similar signs, so it is important to see a medical provider about any of these symptoms.

Diagnosis is made through physical examination; imaging such as ultrasound, mammogram, or MRI; and sometimes biopsy.

Treatment involves a combination of surgery, radiation therapy, and chemotherapy.

The best prevention is a combination of screening mammograms as recommended by the medical provider, and monthly self-examination.

Rarity: Uncommon

Top Symptoms: breast pain, armpit lump, breast mass or retraction, breast lump, nipple discharge

Urgency: Primary care doctor

Questions Your Doctor May Ask About Hard Lump In The Armpit

To diagnose this condition, your doctor would likely ask the following questions:

  • What color is the bump?
  • Any fever today or during the last week?
  • Do you feel pain when you touch the bump?
  • Do you have a rash?

If you've answered yes to one or more of these questions

Please take a quiz to find out what might be causing your hard lump in the armpit. These questions are also covered.

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Hard Lump In The Armpit Symptom Checker Statistics

People who have experienced hard lump in the armpit have also experienced:

  • 27% Painful Armpit Lump
  • 11% Painless Armpit Lump
  • 4% Armpit Lump

People who have experienced hard lump in the armpit were most often matched with:

  • 80% Skin Abscess
  • 20% Pimple

People who have experienced hard lump in the armpit had symptoms persist for:

  • 43% Less than a week
  • 21% Over a month
  • 13% Less than a day

Source: Aggregated and anonymized results from Buoy Assistant (a.k.a. the quiz).

Hard Lump In The Armpit Symptom Checker

Take a quiz to find out what might be causing your hard lump in the armpit