Extra Breast Tissue in the Armpit - Accessory Breast

I recently gave birth and I am currently breastfeeding. I noticed that I have an extra breast tissue in the armpit. Should I be worried?

Axillary accessory breast: presentation and treatment

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Accessory Axillary Breast Tissue

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Is Accessory Breast Tissue Harmful? All You Need To Know

Is it fat? or is it accessory breast? – HSIA

🥇 Ectopic Breast Tissue

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Oh! The places you can Grow! Accessory Breast Tissue — Mattos