This article is from the Ducatis Motorcycles FAQ, by Duke Robillard email@example.com with numerous contributions by others.
Probably not. This can happen from time to time on bikes (cars, too) with
no oil consumption at all. Many Ducati owners have noticed this phenomenon,
and it doesn't seem to correlate to any problem areas. As long as the
electrodes and the insulators look good, you can postulate a more realistic
picture of the health of the engine.