From the Research
Breast tissue can occur on the arms, though it is uncommon, and this condition is known as accessory or ectopic breast tissue, which develops when breast tissue forms outside the normal breast area during embryonic development. This tissue contains the same components as normal breast tissue and may respond to hormonal changes during puberty, pregnancy, or menstruation 1. While accessory breast tissue most commonly appears in the axilla (armpit), it can occasionally extend down the arm. Some key points to consider about accessory breast tissue include:
- It occurs in approximately 0.4-6% of the general population 2
- It may undergo hormonal changes, similar to normal breast tissue 1
- It can cause discomfort, cosmetic concerns, or anxiety, and may require surgical removal 3, 4, 5
- It is essential to distinguish accessory breast tissue from other breast pathologies, both benign and malignant, to ensure proper diagnosis and treatment 1
If you notice unusual tissue growth on your arm that swells or becomes tender during hormonal cycles, it is crucial to consult a healthcare provider for evaluation to rule out other conditions. Treatment is typically not necessary unless the tissue causes discomfort or cosmetic concerns, in which case surgical removal may be an option 3, 4, 5. Remember that any unusual growth should be examined by a medical professional to ensure proper diagnosis and treatment.