I have a fatty feeling movable lump directly under my collarbone on the right side. A little bigger than a quarter. No pain or redness or discomfort.

Fatty deposit . It sounds like you have a fat deposit called a lipoma these are usually benign tumors and if they get to large you may need surgical resection. To be on the safe side I recommend that you follow up with a surgeon to have this removed and biopsied and reviewed by a pathologist.