O candle-faced beloved, the mark on the chest of the moon is merely the scar left by the radiant glow of your beauty.

The poet looks up at the night sky and offers a delightfully grand compliment to his radiant beloved. He imagines that the dark blemish on the moon is not a natural flaw, but a searing burn mark caused by the sheer, dazzling radiance of the beloved's face. It is a classic stroke of poetic exaggeration where the moon itself is left scarred and humbled by a beauty far brighter than its own.