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If a Shadow Priest or Affliction Warlock is placing DoTs on you (unless they're being Dispelled): wait until all the DoTs are on you before you use Barkskin you will be taking more damage during this period of time rather than a period of time including the casting of the DoT effects, and so you will get more out of Barkskin.
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If you choose to do this, realize that the best time to use Barkskin is when you're taking the most damage in a short period of time - many people do not realize this. Comment by SahrishIn PvP, sometimes it is better to use this purely for damage mitigation rather than pushback prevention.
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