GILBERT S. GRANT / SCIENCE PHOTO LIBRARY GILBERT S. GRANT / SCIENCE PHOTO LIBRARY
Chickenpox. Chickenpox blisters on the back of a child. Chickenpox (or varicella) is a common infectious disease of childhood. The disease is characterized by headache, fever and malaise followed by eruption of a rash over most of the body. The rash appears in crops and consists of clusters of small, red, itchy spots that become small fluid-filled blisters within a few hours. It is rare to have the disease twice, as a childhood attack confers lifelong immunity. People who did not have the disease as a child should avoid sufferers, as it is dangerous in adults. Calamine lotion can be used to relieve itching. The disease usually clears up by itself.
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