Underarm Lump

An underarm lump, or an “axillary mass”, has a variety of causes, but is usually a swollen axillary lymph node. Causes of a swollen lymph node include lymphatic conditions (e.g. lymphadenopathy, lymphoma), arm infection, breast condition (e.g. mastitis ...

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Causes

Causes of a swollen underarm lump include:

  • Swollen axillary lymph node (lymphadenitis)
  • Lipoma
  • Sebaceous cyst
  • Aneurysm
  • Cystic hygroma
  • Hydradenitis suppurativa
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Note: This site is for informational purposes only and is not medical advice. See your doctor or other qualified medical professional for all your medical needs.