The hydroxychloroquine–interferon gamma release assay question: TB or not TB?

Hydroxychloroquine (HCQ) is a workhorse of medical dermatology. Aside from treating malaria, it has been used to treat the spectrum of immunologically implicated dermatoses from annular elastotic granuloma to urticarial vasculitis. Most typically, it is a standard treatment for lupus erythematosus, dermatomyositis, lichen planopilaris, granuloma annulare, sarcoidosis, and reticular erythematous mucinosis. Evaluating results of an interferon-γ...