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Case scenario 45 year old female patient presents with a pai | International surgical boards

Case scenario

45 year old female patient presents with a painful red firm nodule under her fingernail (see above figure), there is no history of trauma, the pain was relieved when a tourniquet was applied at the mid-arm, it was extremely tender when touched, the patient reports that the pain is worse at night and prevents sleep.

What is the most probable diagnosis?