Hard to tell if it's mold from these photos, but I think the easiest way is to inspect the surface of the white area -- if it's plume, it will appear to be somewhat crystalline, almost like dried sugar and thin, without rising above the surface of the wrapper. If it's mold, it will appear to have have an almost hairy-like surface that rises visibly above the wrapper. Since you caught it early, I'd use some high proof grain alcohol, such as 100 proof vodka or alcool on a Q-tip or paper towel and carefully rub it off.
If you haven't done so already, I'd check out all your cigars, not just these coffins as mold, under the right conditions, will affect other sticks in your stash as well.
As someone else mentioned, humidity control is crucial and must be kept in check. A steady 65% RH is recommended.