Tā bèi zhěnduàn chū xìtǒngxìng hóngbān lángchuāng.
She was diagnosed with systemic lupus erythematosus.
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A calque of the Latin lupus ('wolf'): both languages name the disease after the wolf-bite-like facial rash. 红斑狼疮 literally 'red-spot wolf-sore' = lupus erythematosus.