Hello
I am a breast cancer survivor, right side 7 years ago. Have noticed a hard lump on my collarbone, feels like hard bone and is the size of a large marble. I have some night sweats but have had these for years. Also slight tingling around my mouth. I also have a slight thyroid imbalance that is currently untreated, and suspected sjogrens.
What are the causes of a lump on the collarbone.
Had a mammogram about three months ago, and nothing showed.