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You are seeing an 8 year old male with 3 days of progressively worsening redness, tenderness, and swelling of his right index finger proximal lateral nail fold and adjacent skin. The central portion of the swollen area shows a small amount of subcutaneous purulent fluid. He is right-hand dominant, otherwise healthy, and is afebrile. He admits to having a habit of biting his fingernails.

Which of the following is considered appropriate treatment for this condition?