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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 is the difference between Gianotti-Crosti syndrome and papular acrodermatitis of childhood?

Fig. 24.3 Acral-located red papules in papular acrodermatitis of childhood Gianotti-Crosti syndrome.

Gianotti-Crosti syndrome and papular acrodermatitis of childhood are synonyms for a viral eruption characterized by the acute onset of a symmetrical, erythematous papular eruption that is accentuated on the face, extremities, and buttocks (Fig. 24-3). It most commonly occurs in young children between the ages of 1 to 3 years but may occur in younger children or even adolescents.