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    Armpit lump

    Lump in the armpit; Localized lymphadenopathy - armpit; Axillary lymphadenopathy; Axillary lymph enlargement; Lymph nodes enlargement - axillary; Axillary abscess

    An armpit lump is swelling of one or more lymph nodes under the arm.


    An armpit lump in a woman should be checked by a health care provider immediately, as it may be a sign of breast cancer.


    Lumps in the armpit may have many causes. Lymph nodes are filters that can catch germs or cancerous tumor cells. When they do, lymph nodes increase in size and are easily felt.

    Cysts and infections of the skin of the armpit may be caused by shaving or use of antiperspirants (not deodorants). This is most often seen in teens just beginning to shave.

    Abscesses under the skin may also produce large, painful lumps in the armpit.

    Other causes of armpit lumps may include:

    • AIDS
    • Arm or breast infection
    • Cat scratch disease
    • Cancers such as lymphoma or breast cancer
    • Chickenpox
    • Infectious mononucleosis
    • Lipomas (harmless fatty growths)
    • Normal breast tissue (breast tissue extends into the armpit area)
    • Use of certain medicines or vaccinations
    • Shingles (herpes zoster)

    Home Care

    Home care depends on the reason for the lump. Check with your health care provider to determine the cause.

    When to Contact a Medical Professional

    Call your doctor or nurse if youhave any unexplained armpit lumps. Do not try to diagnose lumps without professional help.

    What to Expect at Your Office Visit

    Your doctor or nurse will examine youand ask questions about your medical history and symptom, such as:

    • When did you first notice the lump?
    • Is it getting better, worse, or staying the same?
    • Are you breastfeeding?
    • Have you noticed any factors that make it worse?
    • What other symptoms are also present?
    • Is the lump painful?

    The physical examination may include gently pressing the nodes with the fingertips.

    Testing depends on what is found during the physical examination.


    Armitage JO. Approach to the patient with lymphadenopathy and splenomegaly. In: Goldman L, Ausiello D, eds. Cecil Medicine. 24th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 171.

    Tower RL II, Camitta BM. Lymphadenopathy. In: Kliegman RM, Behrman RE, Jenson HB, Stanton BF, eds. Nelson Textbook of Pediatrics. 19th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 484.


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      A Closer Look

        Self Care

          Tests for Armpit lump

            Review Date: 8/14/2012

            Reviewed By: Linda J. Vorvick, MD, Medical Director and Director of Didactic Curriculum, MEDEX Northwest Division of Physician Assistant Studies, Department of Family Medicine, UW Medicine, School of Medicine, University of Washington. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M. Health Solutions, Ebix, Inc.

            The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.

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            St. Luke's Hospital - 232 South Woods Mill Road - Chesterfield, MO 63017 Main Number: 314-434-1500 Emergency Dept: 314-205-6990 Patient Billing: 888-924-9200
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