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Painless lump under armpit

hi my name is cody and I am a 17 teen years old male.. i have a painless moveable lump at the bottom of my left armpit. Its about the size of a pea and its smooth and kind of hard. It gets gets bigger every so often but within a days it goes back down to the size of a pea or smaller.... about a year ago i went in to see a docter because i had a lump under my nipple,cheek,chin and behind my neck... i later got a ultrasound done on my armpits,groin,and scrotum... after the ultrasound was done they said i had nothing to worry about that everything was okay... its been about a year now since then and a few months ago why showering i came across that lump... could someone please help?.. could this lump be cancer??
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replied February 1st, 2010
It is unlikely that a small lump in your armpit which has not appreciably changed in size over a year or more will turn out to be cancer. However, if this lump begins to enlarge, or/and other lumps appear (and are enlarging), then you should be reevaluated by your doctor.

Sincerely/ Robert A. Wascher, MD, FACS

A landmark, evidence-based guide to a healthy cancer-prevention lifestyle, based on cutting-edge cancer research.
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replied March 23rd, 2019
Thank you for asking at Ehealth forum!

I read your question and I understand your concern.
You might feel muscle. Any how lumps in the armpit are significant clinically only if they are more than 3cm in size,hard or rubbery and there are constitutional symptoms as well.
I hope it helps. Stay in touch with your healthcare provider for further guidance as our answers are just for education and counselling purposes and cannot be an alternative to actual visit to a doctor.
Take care
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