How old is Legosi again? 17? His mother started sprouting komodo dragon scales from 18, 19?
I know he's only 1/4 komodo, but that doesn't completely dismiss it won't happen to him either, or perhaps something else will?
If his body were to start doing the same, that would erase some of those scars, and that meaningless tattoo.
But perhaps that's being too optimistic...
I feel that the background story on his mother was a foreshadowing for Legosi's physical development.
He's not done going through puberty...