Skin is a seamless organ, like a fine cloth protecting valuable assets. Imagine a piece of silk. Just one small tear can make a big difference in how it looks. And it's the same with skin. Any burn, injury, or other trauma, such as surgery, can cause a scar.
Now a scar isn't bad if it's small or in a location that's easy to conceal. But when it's not, you may wonder if there's a way to treat it, other than hiding it under your clothes, that will make it go away or at least change how it looks.