Varicella is an 18th century term for the disease now called chickenpox. According to the US Centers for Disease Control and Prevention, it is "an acute contagious disease characterized by papular and vesicular lesions." In English that means that it causes small red bumps and blisters on the skin. These bumps itch, which can lead to scratching and scarring. People who contract varicella are at risk of developing the condition called Shingles later in life. There is currently a vaccine against varicella.