What causes an armpit lump or pain?

  • Swollen lymph nodes reacting to a nearby infection — in the skin, arm, or occasionally after a vaccination — the most common cause
  • An ingrown hair, skin infection, or blocked sweat gland
  • A cyst
  • Less commonly, a change in a lymph node related to a breast condition
When to see a doctor See Dr. Chandak if an armpit lump doesn't go away within a few weeks, keeps growing, feels hard and painless, or comes with a breast lump, unexplained weight loss, or night sweats.

What to expect at the clinic

Dr. Chandak will examine the area and, if needed, recommend an ultrasound to look more closely. If something needs further evaluation, FNAC or a biopsy can confirm exactly what it is.

Frequently asked questions

No. Most armpit lumps are due to reactive lymph nodes from a minor, nearby infection, not a breast condition.

If it persists beyond a few weeks, keeps growing, feels hard, or comes with other symptoms like a breast lump or unexplained weight loss, it's worth getting checked.

Usually an ultrasound first, with FNAC or biopsy added if the finding needs further evaluation.