If you are referring to a character named Jagi from the manga and anime series "Hokuto no Ken" (Fist of the North Star), the seven scars on his chest are a significant part of his backstory and character design. Jagi, who is a rival to the main character Kenshiro, received those scars as a result of his own actions and the consequences of his rivalry with Kenshiro. The scars symbolize both his failure to match Kenshiro’s strength and the darker aspects of his character, as well as his obsession with proving himself against his brother.
If you're asking about a different character or context, please provide more details for a more accurate answer!