Read below about hard lump in the armpit, including causes and common questions. Or get a personalized analysis of your hard lump in the armpit from our A.I. health assistant. At Buoy, we build tools that help you know what’s wrong right now and how to get the right care.

A.I. Health Assistant

Take a quiz to find out why you’re having hard lump in the armpit

Take Quiz

A.I. Health Assistant Causes for Hard Lump in the Armpit

Updated on Aug. 29, 2018

The list below shows results from the use of our A.I. Health Assistant by Buoy users who experienced hard lump in the armpit. This list does not constitute medical advice.

  1. 1.Skin Cyst

    An epidermoid cyst is a closed sac under the skin filled with a cheese-like or oily material. It is caused by trauma or surgery.

    Resolves with treatment

    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
  2. 2.Pimple

    Acne, also known as pimples, occurs when hair follicles become clogged with oil & dead skin cells. Acne is extremely common and ranges from mild to severe.

    The severity of the acne dictates treatment-type and duration. With proper treatment, acne should resolve in weeks to months. In some cases, acne is a long-term condition.

    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
  3. 3.Skin Abscess

    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"), which is dangerous and requires treatment.

    Good prognosis with treatment

    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
  4. 4.Boil (Furuncle)

    Boils are infections of a hair follicle that creates a small pocket of inflammation full of pus. It's typically caused by a common bacteria called S. Aureus.

    5-10 days

    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
  5. 5.Non - Hodgkin Lymphoma

    Non-Hodgkin lymphoma is a cancer of the lymphatic system, which is part of the immune system. Cells in the lymph nodes or bone marrow grow abnormally and may spread beyond the lymphatic system.

    Curable but survival rates are variable depending on the subtype.

    Rarity:
    Ultra rare
    Top Symptoms:
    fatigue, loss of appetite, abdominal pain (stomach ache), fever, shortness of breath
    Symptoms that never occur with non-hodgkin lymphoma:
    neck lump that comes and goes, shrinking neck bump, armpit lump that comes and goes, shrinking armpit lump, groin lump that comes and goes, shrinking groin lump
    Urgency:
    Primary care doctor

    Hard Lump in the Armpit Checker

    Take a quiz to find out why you’re having hard lump in the armpit.

    Take Quiz
  6. 6.Folliculitis

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

    Mild cases clear in a few days. More severe ones can cause hair loss and scarring.

    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
  7. 7.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.

    92-96% resolve with treatment within 7-10 days

    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
  8. 8.Hodgkin's Lymphoma

    Hodgkin lymphoma is a cancer of the lymphatic system, which is part of the immune system. Cells in the lymph nodes grow abnormally and may spread beyond the lymphatic system.

    Curable but survival rates are variable

    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
  9. 9.Wart

    Warts are non-serious skin growths caused by a virus that infects the top layer of the skin. They are contagious. Thus, warts on the face are often spread there by the hands, and vice versa.

    78% go away in 2 years

    Rarity:
    Common
    Top Symptoms:
    small facial lump, painless facial bump, skin-colored facial bump, scaly facial bump
    Symptoms that never occur with wart:
    headache
    Urgency:
    Self-treatment
  10. 10.Breast Cancer

    Breast cancer affects one in eight women during their lives. It is caused by uncontrolled and fast growth of damaged cells in the breast tissue. These cells can also move to the lymph nodes and sometimes other organs. The main symptom of breast cancer is a hard or firm, non-mobile, usually non-tender lump in the breast that increases in size.

    Indefinite

    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

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

If you've answered yes to one or more of these questions, try our hard lump in the armpit symptom checker to find out more.

Take Quiz

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 had symptoms persist for:

    • 43% Less Than a Week
    • 21% Over a Month
    • 13% Less Than a Day
  • People who have experienced hard lump in the armpit were most often matched with:

    • 80% Skin Abscess
    • 20% Pimple
  • Source: Aggregated and anonymized results from visits to the Buoy AI health assistant (check it out by clicking on “Take Quiz”).

A.I. Health Assistant

Take a quiz to find out why you’re having hard lump in the armpit

Take Quiz