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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?

Which viruses cause grouped blisters on a red base?

A, Grouped vesicles limited to a dermatome in herpes zoster infection. B, Discrete palmar vesicle in epidemic hand, foot, and mouth syndrome. (Panel A courtesy of James E. Fitzpatrick, MD.)

Fig. 24.2 A, Grouped vesicles limited to a dermatome in herpes zoster infection. B, Discrete palmar vesicle in epidemic hand, foot, and mouth syndrome. (Panel A courtesy of James E. Fitzpatrick, MD.)

Herpes simplex virus and varicella-zoster virus (Fig. 24-2A).