09-20-2008, 10:08 PM
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I don't think you can actually do anything. It similar as what happens with saddle sores. When a rubbed area grows back white instead of the same as the rest of the coat color. One of my biggest nightmares with my horses. Luckily with a tail with time new hair should grow back the color it's meant to be.
All I can say is to let it grow back :)