Below my collarbone on the right side of my chest there is a lump, and recently there's been pain there as well, what could it be?

Right side chest mas: Mass on the chest wall could be from the skin, subcutaneous tissue, bone or breast issue, You really need a physical exam, get it checked put

Chest mass: Many possibilities, but commonly benign explanations are sebaceous cysts, furuncle (deep abscess), and lipoma (less painful). Less likely breast related mass or lymph node, vascular anomalies should be considered.

Chest wall mass: Could be just about anything from an abscess,inclusion cyst, lipoma or possibly a reactive lymph node. If it persists see your doctor. They may suggest an FNA, fine needle aspiration so that cells can be examined by a pathologist. They could also elect just to excise it and send the whole lesion for pathology review.