Why can I feel lumps under my armpits?

The bumps you feel under your armpits may be caused by accessory breast tissue, fat accumulation, swollen lymph nodes or skin lesions. If necessary, you need to see a doctor for confirmation.

Accessory breasts are a relic of embryonic development, referring to extra breast tissue outside of normal breasts. They are often found in the armpits and feel like soft lumps, which are sometimes more obvious before menstruation or during hormonal changes. In addition to accessory breasts, pimples in the armpits may also be related to hidradenitis, lymph node reactions, or fat accumulation. Especially if they are accompanied by pain, redness, swelling, or gradual enlargement, they need to be taken seriously.

Self-examination can be used to preliminarily assess the nature of the lump: accessory breasts are usually soft and painless, and their size may fluctuate slightly with the menstrual cycle; swollen lymph nodes are usually hard and painful, which may reflect infection or immune response; skin problems such as hidradenitis may manifest as pain, redness, or even suppuration. If the lump you feel is hard, fixed, and grows irregularly, you should consult a doctor as soon as possible to check for possible diseases.

Pay attention to the hygiene and cleanliness of your armpits and avoid irritation from tight clothing. If the pimples are worrisome, such as being fixed, continuing to grow, or accompanied by other symptoms, you should see a doctor promptly for a more comprehensive evaluation such as ultrasound, CT, or tissue examination. Regular health checkups can also help with early detection and treatment.