An armpit lump refers to enlargement of one or more lymph nodes under the arm.
Lump in the armpit; Localized lymphadenopathy - armpit; Axillary lymphadenopathy; Axillary lymph enlargement; Lymph nodes enlargement - axillary; Axillary abscess
Lumps in the armpit have various causes.
Lumps may occur when lymph nodes are swollen due to bacterial or viral infections,
Lymph nodes are filters that can catch infectious organisms or cancerous
- Bacterial infection
- Arm or breast infection
- Cat scratch disease
- Benign (harmless) cyst
Lipomas(harmless fatty growths)
- Normal breast tissue (breast tissue extends into the armpit area)
Allergic reactionpossibly caused by sulfa drugs, iodine, or penicillin
Measles, mumps, rubella vaccine (rare)
- Smallpox vaccination
- Typhoid vaccine
- Viral infection
AIDS Chickenpox Infectious mononucleosis
- Shingles (
Review Date: 08/02/2009
Reviewed By: Linda Vorvick, MD, Medical Director, MEDEX Northwest Division of Physician Assistant Studies, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.