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According to the US Centers for Disease Control and Prevention, '''Varicella''', also known as chickenpox, is "an acute [[contagious]] disease characterized by papular and vesicular lesions."<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#v</ref>In english that means that it causes small red pock marks or blisters. These pock marks itch which can lead to scratching and scaring.