I discovered a book called The Healing Buddha by Raoul Birnbaum, which introduced me to a Buddha of whom I had never heard

Homage to Bhaiśajyaguru, Master of Healing

He is deep blue, the color of the finest lapis lazuli. He has a mature male form possessing all the major and minor marks of a Buddha: his deep indigo hair, the indigo curl between his eyebrows, the top-knot surmounting his head, his finely formed limbs — each mark a sign of perfection.

He wears saffron robes, this perfect one, this dweller in the sublime abodes. He holds his left hand as if in meditation, the fingers gently supporting a begging bowl formed from gold-traced lapis lazuli. It contains something mysterious that has the taste of freedom: amrita, sacred nectar.

His right arm stretches downwards, the hand turned outwards in the gesture of giving. In his palm he holds the healing yet bitter-tasting myrobalan fruit, attached to leaves and twigs from its mother tree.

Circling his head is the green halo that marks one who has gone beyond, marks the precious state of Enlightenment. Around his body is a blue aura, for he is the King of Lapis Lazuli Radiance. His mantra resounds:

Om Bhaiśajya Bhaiśajya Mahabhaiśajya Bhaiśajyaraja Samudgate Svaha

Om Bhaiśajya Bhaiśajya Mahabhaiśajya Bhaiśajyaraja Samudgate Svaha

Om Bhaiśajya Bhaiśajya Mahabhaiśajya Bhaiśajyaraja Samudgate Svaha

https://www.wildmind.org/mantras/figures/bhaishajyaguru-medicine-buddha-mantra