Read below about bump on the bicep or tricep, including causes and common questions. Or get a personalized analysis of your bump on the bicep or tricep 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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10 Potential Bump on the Bicep or Tricep Causes

Disclaimer: The article does not replace an evaluation by a physician. Information on this page is provided as an information resource only, and is not to be used or relied on for any diagnostic or treatment purposes.

  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:
    neutral colored upper arm mass, small upper arm bump, marble-sized upper arm bump
    Symptoms that always occur with skin cyst:
    neutral colored upper arm mass
    Urgency:
    Wait and watch
  2. 2.Lipoma

    A lipoma is a noncancerous growth of fatty tissue cells. A lipoma can develop in almost any organ of the body although they are most commonly found in the subcutaneous layer just below the skin.

    Resolves with treatment

    Rarity:
    Uncommon
    Top Symptoms:
    neutral colored upper arm mass, small upper arm bump, marble-sized upper arm bump
    Symptoms that always occur with lipoma:
    neutral colored upper arm mass
    Urgency:
    Wait and watch
  3. 3.Wart

    Warts are non-serious skin growths caused by a virus that infects the top layer of the skin. They are contagious.

    78% go away in 2 years

    Rarity:
    Common
    Top Symptoms:
    neutral colored upper arm mass, painless arm bump, small upper arm bump, scaly upper arm bump
    Urgency:
    Self-treatment
  4. 4.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 arm bump, small upper arm bump, painful arm bump, marble-sized upper arm bump
    Symptoms that always occur with pimple:
    pink or red arm bump
    Urgency:
    Self-treatment
  5. 5.Basal Cell Carcinoma

    Basal cell carcinoma is a slow-growing form of skin cancer. Skin cancer falls into two major groups: Non-melanoma and melanoma. Basal cell carcinoma is a type of non-melanoma skin cancer.

    Indefinite

    Rarity:
    Uncommon
    Top Symptoms:
    neutral colored upper arm mass, painless arm bump, small upper arm bump, marble-sized upper arm bump, growing upper arm bump
    Urgency:
    Primary care doctor

    Bump on the Bicep or Tricep Checker

    Take a quiz to find out why you’re having bump on the bicep or tricep.

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  6. 6.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 arm bump, small upper arm bump, painful arm bump, marble-sized upper arm bump
    Symptoms that always occur with boil (furuncle):
    pink or red arm bump
    Symptoms that never occur with boil (furuncle):
    fever
    Urgency:
    Self-treatment
  7. 7.Dermatofibroma

    Dermatofibroma (superficial benign fibrous histiocytoma) is a common cutaneous nodule of unknown etiology that occurs more often in women. Dermatofibroma frequently develops on the extremities (mostly the lower legs) and is usually asymptomatic, although pruritus and tenderness can be present

    Resolves with treatment

    Rarity:
    Rare
    Top Symptoms:
    upper arm itch, neutral colored upper arm mass, small upper arm bump, painful arm bump, marble-sized upper arm bump
    Urgency:
    Wait and watch
  8. 8.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").

    Good prognosis with treatment

    Rarity:
    Common
    Top Symptoms:
    pink or red arm bump, painful arm bump, large upper arm bump, marble-sized upper arm bump
    Symptoms that always occur with skin abscess:
    pink or red arm bump
    Symptoms that never occur with skin abscess:
    fever
    Urgency:
    Primary care doctor
  9. 9.Non - Specific Arm Rash

    A rash is an area of irritated or swollen skin. Often, rashes are unidentifiable and some variation of normal. For example, scratching one's arm causes it to turn red (which is caused by mast cells releasing chemicals into the local area), but that's completely normal.

    1-2 days

    Rarity:
    Common
    Top Symptoms:
    upper arm redness
    Symptoms that always occur with non-specific arm rash:
    upper arm redness
    Symptoms that never occur with non-specific arm rash:
    fever
    Urgency:
    Wait and watch
  10. 10.Melanoma

    Melanoma is the most serious type of skin cancer. Often the first sign of melanoma is a change in the size, shape, color, or feel of a mole. Most melanomas have a black or black-blue area. Melanoma may also appear as a new mole. It may be black, abnormal, or "ugly looking."

    Indefinite

    Rarity:
    Rare
    Top Symptoms:
    atypical upper arm bump features, growing upper arm bump, large upper arm bump, brown-colored skin changes, marble-sized upper arm bump
    Symptoms that always occur with melanoma:
    atypical upper arm bump features
    Urgency:
    Primary care doctor

Questions Your Doctor May Ask About Bump on the Bicep or Tricep

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

If you've answered yes to one or more of these questions, try our bump on the bicep or tricep symptom checker to find out more.

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Bump on the Bicep or Tricep Symptom Checker Statistics

  • People who have experienced bump on the bicep or tricep have also experienced:

    • 4% Pain in the Upper Arm
    • 3% Forearm Pain
    • 3% Pain in One Arm
  • People who have experienced bump on the bicep or tricep had symptoms persist for:

    • 34% Over a Month
    • 31% Less Than a Week
    • 16% Less Than a Day
  • People who have experienced bump on the bicep or tricep were most often matched with:

    • 30% Skin Cyst
    • 27% Lipoma
    • 21% Wart
  • Source: Aggregated and anonymized results from visits to the Buoy AI health assistant (check it out by clicking on “Take Quiz”).

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