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Double-masking found to reduce SARS-CoV-2 spread, FDA decision on antibody cocktail for treatment of COVID-19, and 8 more news briefs summarized for primary care.

Seen in the emergency department case quiz - progressive finger pain

A man in his fifties presents with pain in a fingertip that has been getting increasingly worse. Notable on exam are a small scab on that finger and nail-bitten fingernails. Your Dx?