Chickenpox, Varicella-zoster virus, Blisters, Vaccine, Neem, Carrot and Coriander, Aloe vera. Root Cause of Disease Chickenpox is an infection caused by the varicella-zoster virus. It causes an itchy rash with small, fluid-filled blisters. Chickenpox is highly contagious to people who haven’t had the disease or been vaccinated against it. Today, a vaccine is available that…