Read below about darkened skin under the armpit, including causes and common questions. Or get a personalized analysis of your darkened skin under 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.

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A.I. Health Assistant Causes for Darkened Skin Under the Armpit

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

  1. 1.Acanthosis Nigricans

    Acanthosis nigricans is a skin condition in which areas of dark, velvety discoloration appear in body folds and creases, such as armpits, the groin area, and the neck area. The skin changes of acanthosis nigricans usually occur in people who have diabetes or are obese.

    Varies

    Rarity:
    Uncommon
    Top Symptoms:
    skin that is darker than it used to be, darkened skin over the neck, constant skin changes
    Symptoms that always occur with acanthosis nigricans:
    skin that is darker than it used to be
    Urgency:
    Primary care doctor
  2. 2.Skin Tag

    A cutaneous skin tag is a common skin growth. It is small and benign and can occur anywhere on the body, but especially in places where the body folds (armpits, neck, groin, etc).

    Resolves with treatment

    Rarity:
    Common
    Top Symptoms:
    rash, skin-colored rash, lump darker than surrounding skin, skin bump that looks like it has a stalk
    Urgency:
    Wait and watch
  3. 3.Benign Skin Growth

    Seborrheic keratosis is a condition that causes wart-like growths on the skin. The growths are benign (not-cancerous) and look like stuck-on plaques.

    Resolves with treatment

    Rarity:
    Common
    Top Symptoms:
    constant skin changes, itchy rash, rash with well-defined border, abdominal skin changes, neck skin changes
    Symptoms that always occur with benign skin growth:
    constant skin changes
    Symptoms that never occur with benign skin growth:
    cherry red lower leg bump
    Urgency:
    Wait and watch

    Darkened Skin Under the Armpit Checker

    Take a quiz to find out why you’re having darkened skin under the armpit.

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  4. 4.Hemochromatosis

    Hemochromatosis is a disease in which too much iron builds up in the body. This can be hereditary or caused by another condition like liver failure.

    Lifelong

    Rarity:
    Uncommon
    Top Symptoms:
    fatigue, abdominal pain (stomach ache), joint pain, decreased sex drive, frequent urination
    Urgency:
    Primary care doctor
  5. 5.Adrenal Insufficiency

    The adrenal gland's outer layer produces hormones such as cortisol and aldosterone, which control many important functions of the body such as blood sugar and blood pressure regulation, and urine production. In adrenal insufficiency, not enough of these hormones are produced, leading to symptoms such as fatigue and weakness, appetite and weight loss, nausea, and vomiting.

    Adrenal insufficiency is a chronic condition that requires lifelong management, and can be fatal if not treated.

    Rarity:
    Ultra rare
    Top Symptoms:
    depressed mood, anxiety, abdominal pain (stomach ache), loss of appetite, nausea or vomiting
    Urgency:
    Primary care doctor
  6. 6.Folate (Vitamin) Deficiency

    Folic acid (folate) is a vitamin that is needed to make new cells in the body, including red blood cells which carry oxygen through the blood and into various tissues throughout the body. Folate deficiency refers to a condition when there is not enough folic acid in the body, and can lead to symptoms such as tiredness, low energy, faintness, and difficulty breathing.

    People recover with no long-term effects within weeks.

    Rarity:
    Rare
    Top Symptoms:
    fatigue, depressed mood, irritability, nausea or vomiting, diarrhea
    Symptoms that never occur with folate (vitamin) deficiency:
    abdominal swelling
    Urgency:
    Phone call or in-person visit

Questions Your Doctor May Ask About Darkened Skin Under the Armpit

  • Q.Have you ever been diagnosed with diabetes?
  • Q.Have someone press on the upper right corner of your abdomen (see picture). Does this person feel a large lump coming from under your rib cage?
  • Q.Have you been feeling more tired than usual, lethargic or fatigued despite sleeping a normal amount?
  • Q.What is your body mass?

If you've answered yes to one or more of these questions, try our darkened skin under the armpit symptom checker to find out more.

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Darkened Skin Under the Armpit Symptom Checker Statistics

  • People who have experienced darkened skin under the armpit have also experienced:

    • 19% Armpit Itch
    • 9% Skin Changes on Armpit
    • 5% Feeling Itchy or Tingling All Over
  • People who have experienced darkened skin under the armpit were most often matched with:

    • 100% Acanthosis Nigricans
  • 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

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