Vulgaris Explained

Vulgaris, a Latin adjective meaning common, or something that is derived from the masses of common people, may refer to:

Latin: Vulgaris aerae, the Latin translation for the Common Era
Era Vulgaris, pseudo-Latin for Common Era (in Latin this means Common Mistress)
Sermo vulgaris, the vulgar Latin

Diseases

"Vulgaris", when referring to disease names, usually indicates that it is the normal, classic, or most common form of a given disease.

Acne vulgaris, the most common form of the most common skin disease
Ichthyosis vulgaris, the most common form of this rare skin disorder
Impetigo vulgaris, a common skin infection, usually caused by a Streptococcus bacterium
Lupus vulgaris, a skin disease with painful cutaneous tuberculosis lesions
Pemphigus vulgaris, the most common form of pemphigus, a rare group of blistering autoimmune diseases that affect the skin and mucous membranes
Psoriasis vulgaris, the plaque psoriasis, the most common form of psoriasis
Sycosis vulgaris, the barber's itch, a once-common skin infection
Verruca vulgaris, the common wart, a raised wart with roughened surface

As it means "common", the word vulgaris is part of countless specific names for all kinds of species, for example:-

Carnivorous Vulgaris, Famishius Vulgaris Ingenuisi or Overconfidentii vulgaris, three of the fictional species Latin names for Wile E. Coyote in the Wile E. Coyote and Road Runner series