Hi, I’m an 18-year-old guy. I’m trying to figure out what this bump near my ribs might be. It feels firm, doesn’t move, and isn’t painful or very large. Could it be some kind of tumor, lymphoma, or a cancerous growth? I’ve uploaded a video to my profile if you want to see it! Thanks in advance! 
It’s likely just costal cartilage where it attaches to your breastbone.