Here, healing doesn't mean the damage disappeared. The speaker says every bruised part has healed, but the scars remain, and what changes is how they're seen. When "you" trace them, they form a constellation. A person who might have felt marked by old hurts is suddenly being read like a night sky, with patience and attention.
The speaker then names the pattern Sirius, a star known for being bright, and ends on a note of hope: "In hopes it shines as bright." That final line is quiet and a little uncertain. The speaker isn't claiming to be radiant, only wishing to be. The title "Canis Major," the constellation Sirius belongs to, supports the image.
The mood is tender and intimate, with some vulnerability underneath. It suggests that being truly seen by someone can turn pain into something worth looking at.