Sugar skull tattoos, also known as alfeñiques, are a symbol of the Mexican holiday Dia de los Muertos (Day of the Dead) and represent the celebration of life and remembrance of loved ones who have passed away. The skulls are often decorated with vibrant colors and flowers, signifying the beauty and sweetness of life, as well as the inevitability of death. By wearing a sugar skull tattoo, individuals can express their cultural heritage, honor their ancestors, and acknowledge the cycle of life and death.