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Viral Exanthems

»	What is the difference between an exanthem and an enanthem?
»	Which viruses cause exanthems?
»	How do viruses cause exanthems?
»	Which viruses cause morbilliform (measles-like) eruptions?
»	Which viruses cause grouped blisters on a red base?
»	Which viruses cause hand, foot, and mouth disease?
»	What is the difference between Gianotti-Crosti syndrome and papular acrodermatitis of childhood?
»	Which are the most common viruses that cause papular acrodermatitis of childhood?
»	Which virus classically causes a lacy eruption?
»	Which viruses cause scarlatina (scarlet fever–like) eruptions?
»	Which virus causes purpura of the hands and feet?
»	Do viral exanthems cause petechiae?
»	Can viral exanthems be on one half of the body?
»	Which disorder most commonly mimics a viral morbilliform eruption?
»	What are the clinical features of roseola infantum (exanthem subitum, sixth disease)?
»	How does sunlight exposure affect a viral exanthem?
»	What is the STAR complex?
»	Which viruses cause the STAR complex?

What are the clinical features of roseola infantum (exanthem subitum, sixth disease)?

Roseola infantum demonstrating subtle, evanescent, erythematous papular exanthem. (Courtesy of the Fitzsimons Army Medical Center teaching files.)

Fig. 24.6 Roseola infantum demonstrating subtle, evanescent, erythematous papular exanthem. (Courtesy of the Fitzsimons Army Medical Center teaching files.)

Roseola infantum is a disease that typically presents in infants and very young children as 2 to 5 days of high fever (103° F to 105° F) in an otherwise healthy infant, followed by defervescence and the appearance of pale, small, pink papules that are primarily located on the trunk and head (Fig. 24-6). The exanthem typically lasts from hours to 1 or 2 days. It is most commonly caused by HHV-6 and, less commonly, HHV-7.