system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 how does fire cause permanent scars, and what happens at cells etc. level that we can't see?
gpt
Any time your skin is damaged badly enough, your body panics and repairs it as quickly as possible to prevent infection, stop bleeding, etc. This rapid repair mechanism creates strong rugged scar tissue, rather than the slower, more careful process of replacing it with normal skin. A minor burn can heal without a scar, but a bad burn will trigger the scarring response.