I have a hard lump on the right side of my collar bone. It does not move or hurt. Any ideas what this could be please?

Blocked gland? A sebaceous cyst is a collection of oily fluid that occurs when an oil gland is blocked. Some folks are more prone to them than other and they often appear on the neck, shoulders, and back. Try to avoid skin products that are oily. Stay away from transfats and bad oils, which is good for overall health. See doc for proper diagnosis because it could be more serious.