Can Trauma Cause Lipoma?

I had an injury on my head, neck and left shoulder 2 decades ago. Since then, my left shoulder has bothered me and the area that was hit by a canec tile developed a lipoma. Can a lipoma be due to trauma? How can you tell if a lipoma is directly related to prior trauma? What kind of surgeon would you go to for removal of intramuscular and intermuscular lipoma involving the rhomboid muscle of the shoulder? The lipoma size is about 6-8 inches in diameter.