They're a more purposeful, laid back dog, in most cases, than Pitbulls tend to be. There are exceptions, examples of both lazier Pitbulls and the rare American Bulldog with an inordinate amount of energy, but even then, it's not nervous energy, and such exceptions in no way disprove the rule.
Anterior blepharitis is commonly caused by bacteria (staphyloccus blepharits) or dandruff of the scalp and eyebrows (seborrheic blepharitis). It may also occur due to a combination of factors, or less commonly may be the result of allergies or an infestation of lice on the eyelashes.
This type of blepharitis is thought to be caused by a germ (bacterium) called staphylococcus. This bacterium commonly lives in low numbers on the skin without doing any harm. However, in some people, it seems that this bacterium causes an infection of the eyelids, resulting in blepharitis.