Hello, I heard of you from Postscript and decided to drop by.

The introduction usually provides background information about the story, such as the setting and characters; I think that what you have here is a prologue, but whether or not you change it is entirely up to you.

In the first line, when you talk about how his scars refuse to heal, it seems kind of confusing; since scars are the result of a healed wound, and they are only just now not healing, is he still recovering from cuts at an accelerated rate? Or are scars he received that have previously healed now reappearing?

Finally, I would suggest putting in some kind of allusion to what it is he is guarding; even just clarifying whether it is some sort of creature, an object, or a place would be fine; revealing its actual identity is far from necesary.

Your writing style is quite good though, and it definitely catches the reader from the beginning, very good job there. I look forward to reading the first chapter next, and I hope you will check out my own piece.

Seth