Webi recently found about a lump on my left side towards the bottom part of my rib cage. It’s very hard, mobile, and painless. The whole side of my rib cage seems to be te. Webmay 14, 2024 · discovering a lump on your rib can be worrying, so it's important to seek medical advice straight away and understand the potential causes and treatment. Webjul 11, 2024 · a painless lump on the chest can most commonly be caused by a skin condition like an abscess, wart, or cysts. Rare causes for a painless chest wall lump. Webjul 30, 2024 · an abdominal mass is a lump in the tummy (abdomen). The abdomen contains many different structures including the: Stomach and gut (bowel).