MODEL RELEASED. Chickenpox. Young girl with chickenpox (varicella) bathes in a solution of Pinetarsol. Chickenpox is a highly infectious disease caused by a herpesvirus that is transmitted by airborne droplets. Following a mild fever, an itchy rash breaks out that develops into blisters and then scabs. Treatment includes the use of general painkillers such as paracetamol for fever and the application of calamine lotion or Pinetarsol solution to alleviate itchiness of the skin. Chickenpox is rare in adults since an infection in childhood generally confers life-long immunity. An attack in adults often takes a more severe form.