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A 17-year-old presents with a history of increasing dyspnea, dry cough, and low-grade fevers. Coalescing, erythematous, macular lesions are evident on his hands, and hemorrhagic erosions are present on his lips. Lung auscultation reveals bilateral crackles and chest radiograph demonstrates a reticulonodular pattern without consolidation.
What is the most likely diagnosis?
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