The Mexican skulls represent in general the Day of the Dead which is celebrated on the 1st and 2nd of November that is similar to the Christian celebration of All Saints Day. It is an opportunity to celebrate friends and family deceased.
The most common symbol to remember them by is clearly the skull (sugar skull), often accompanied by calls calacas masks. The traditional celebration of Dia de los Muertos began more than 3,500 years ago at the time of the Aztecs who practiced a full month of celebration, during which the spirits of the dead returned to visit the living in the form of skulls. When Spanish conquistadors arrived they brought the Catholic faith and began to convert the natives, changing the culture to the one we know today. The dead are welcomed by their families through the construction of elaborate altars, realized using elements dear to the deceased. It is not known why sugar has had such an important role in the tradition, but it is thought that its abundance and the fact that it was inexpensive as well as its malleability that was used to create a real skull could offer an explanation.
The world of tattoos has taken this ancient tradition to create a unique style, combining influences from all over the world to create styles that are always unique and special.