Sometimes it appears in very small print at the bottom of the label and sometimes it's even abbreviated to a bunch of unintelligible letters. Many wineries make wines outside the DOC rules and regulations. These wines allow the winemaker to run wild and unimpeded by the local traditions. There are something like 3,200 different wine types being made in Italy. They'll read some reviews, see what scores highly and alter their winemaking in an effort to get close to the 100-point rating.
Winemakers seem to be less sensitive to tannin than wine drinkers.
We find many wines of Italy to be extremely tannic. For example, we view Dolcetto as something to drink when it's young. Yet many producers make a wine which has the same fierce tannins as Nebbiolo-based reds. This seems foolish to us. One feature of many Italian wines is they really taste better with food.