Not all scabs mean infection. The easiest way to tell is to soak the foot in some warm water and scrub all the dirt off. Take a look at the scab. If the scab is firmly attached to the pad, and is hard and dry looking, no redness or swelling to the pad, then it is probably healing with no intervention needed. If the scab is loose, still black and soft at the center, there is redness and swelling to the pad, (compare the pad with the scab to the other healthy pad for comparison), then there is probably infection going on inside the foot pad.
If it only looks minor, you can apply some neosporin and wrap the foot for a few weeks. Keep the foot clean and dry and change the bandage every day or ever other day or when it gets wet. Always apply more neosporin before rewrapping.
Use a piece of gauze on the food pad and around the webbing as vet wrap has latex in it which will irritate the soft skin. Wrap tight enough to stay on, but not so tight to cut off circulation. The easiest way to tell if it is on too tightly is the check the toes 5 mins after wrapping. They should be warm to hot, like the unbandaged foot. If the toes are cold, you wrapped too tightly.