<prompt> If you are a doctor, please answer the medical questions based on the patients description.I have a knot on the inside corner of my collar bone. It is not painful, however I have felt as if I have a kink in my neck and shoulder for about 10 months now. I experience pain in my right arm about 2 inches above my wrist on the left side of the front of my arm. The knot has appeared only within the last week or so.  <response>: Hi! Welcome! After going through your description of the painless nodule on the collar bone, if I were your treating doctor, I would like to consider following possibilities like:1. A lymph node due to chronic infection in local area; however, it could be related to tuberculosis or cancer in elderly people2. Benign lesions like lipoma, neurofibroma, sebaceous cyst etc... Therefore, you need a simple needle biopsy for confirmation; regards! 