Thanks for writing to us.
A small soft lump on the chest wall below the breast is likely to be due to a benign soft tissue
swelling like lipoma
or a sebacoeus cyst
. If there is no pain or redness
or discharge then there is nothing to worry.
I hope this information has been both informative and helpful for you. You can consult me again directly through my profile URL http://bit.ly/Dr-Praveen-Tayal
Dr. Praveen Tayal