Originally Posted by
Often1
As to the bloody sock, don't give this a second thought. Imagine how many people have some sort of procedure on their foot/toe and then travel and therefore present with a bloody sock. Just note it to the Officer and it won't cause an even remote issue.
For 'getaway day' after one of the major big city marathons (Boston, London, NYC, Paris) the bloody toenail area count probably runs into the hundreds at the airport.