Step 1: Scrape Up Your Arm
This instructable utilizes a fine example of road rash on the ulnar side of the left forearm just below the elbow.
Step 2: Apply First-aid
If your injury is really manky and you have access to proper medical supplies, you may choose to use a more traditional bandage for the first day or two before moving on to the sock technique.
This injury was dressed with a proper first-aid kit at the site of the incident, thus the nasty tape-marks on the inside of the arm. After painful tape removal in the shower the next morning, we decided to bring out the sock.
Step 3: Acquire a Clean Sock
If you're a paranoid freak you could certainly boil, bleach, or otherwise sanitize your sock; of course, you're probalby not the sort of person to be making a sock bandage in the first place.
Step 4: Cut Off Toe and Turn Inside-out
Why inside out? Inspect the picture below. Athletic socks generally have a looped, terry-cloth style interior; this is much more likely to stick to your wound, leaving fluff and making removal painful. Best to put the smoother side of the sock directly against your skin.
Step 5: Apply Your Sock Bandage
Make sure to put the larger (top) of the sock around your upper arm to maintain proper fit. The heel of the sock should go right over your elbow.
Step 6: Go About Your Business
If there's lots of scabby sticking, just get the sock nice and soggy before (gently!) peeling it off. The shower works well for this. Let your arm dry out a bit and apply more antisceptic if necessary before replacing a fresh, dry sock bandage.
Your old sock bandage can be laundered for re-use.