Posted a year ago by Laser Lotus, this might offer some more insight.

Bodhisattva Medicine King also figures prominently in the Lotus Sutra. The "Teacher of the Law" (tenth) chapter is addressed to Bodhisattva Medicine King. In the "Encouraging Devotion" (thirteenth) chapter, he and Bodhisattva Great Joy of Preaching lead the host of bodhisattvas in vowing to propagate the sutra in the evil age after Shakyamuni's death. The "Medicine King" (twenty-third) chapter describes the austerities he performed in a previous lifetime as a bodhisattva named Gladly Seen by All Living Beings, or simply Gladly Seen. In the remote past, Bodhisattva Gladly Seen heard the Lotus Sutra from the Buddha Sun Moon Pure Bright Virtue. As a result, he mastered a form of meditation that enabled him to manifest any physical form. In gratitude, Gladly Seen entered this meditation and caused flowers and incense to rain down from the heav-ens as an offering to the Buddha Sun Moon Pure Bright Virtue and the Lotus Sutra, but he felt dissatisfied with this offering and decided that it would be more meaningful to offer his own body. After steeping himself in scents and fragrances for twelve hundred years, he anointed his body with fragrant oil and set himself ablaze in the presence of the Buddha. The blaze illuminated worlds equal in number to the sands of eighty million Ganges Rivers, and the Buddhas within them praised his act as the supreme offering. His body burned for twelve hundred years, and after it was consumed, he was reborn in the land of Sun Moon Pure Bright Virtue Buddha, whom he found at the point of entering nirvana. The Buddha transferred his teachings to Bodhisattva Gladly Seen and then died. Gladly Seen cremated the Buddha's body and built eighty-four thousand stupas to enshrine his ashes, to which he then made offerings. Not satisfied, he proceeded to burn his arms as a further offering for seventy-two thousand years. All the bodhisattvas, gods, people, and other beings he had converted grieved to see him without arms, but he declared to them that having offered his own flesh, he would surely attain Buddhahood, whereupon his arms were restored. Later he was reborn as Bodhisattva Medicine King. The "King Wonderful Adornment" (twenty-seventh) chapter says that the bodhisattvas Medicine King and Medicine Superior are reincarnations of Pure Storehouse and Pure Eye who converted their father, King Wonderful Adornment, to the correct teaching. The 23'd chapter of the Lotus Sutra: "When he had finished making this offering, he rose from this samadhi and thought to himself: Though I have employed my supernatural powers to make this offering to the Buddha, it is not as good as making an offering of my own body. "Thereupon he swallowed various perfumes, sandalwood, kunduruka, turushka, prikka, aloes, and liquidambar gum, and he also drank the fragrant oil of champaka and other kinds of flowers, doing this for a period of fully twelve hundred years. Anointing his body with the fragrant oil, he appeared before the Buddha Sun Moon Pure Bright Virtue, wrapped his body in heavenly jeweled robes, poured fragrant oil over his head and, calling on his transcendental powers, set fire to his body. The glow shown forth, illuminating worlds equal in number to the sands of eighty million Ganges. The Buddhas in these worlds simultaneously spoke out in praise, saying: 'Excellent, excellent, good man! This is true diligence. This is what is called a true Dharma offering to the Thus Come One. Though one may use flowers, incense, necklaces, incense for burning, powdered incensed, paste incense, heavenly silken banners and canopies, along with the incense of the sandalwood that grows by the southern seashore, presenting offerings of all such things as these, he can never match this! Though one may make donations of his realm and cities, his wife and children, he is no match for this! Good men, this is called the foremost donation of all. Among all donations, this is most highly prized, for one is offering the Dharma to the Thus Come One' "After they had spoken these words, they each fell silent. The body of the bodhisattva burned for twelve hundred years, and when that period of time had passed, it at last burned itself out.