DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Chickenpox blisters. Close-up of the tongue of a 40-year-old man with numerous chickenpox blisters. Chickenpox, or varicella, is caused by infection with the herpes virus varicella-zoster. It is common in children but, because infection confers life-long immunity to the disease, rare in adults. Symptoms include a mild fever followed by the development of itchy pimples, these later develop into blisters (as seen here), then scabs. Secondary infections are a possible complication, adults are particularly prone to pneumonia.
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