What is roseola infantum?

Written by Yan Xin Liang

Pediatrics

Updated on January 26, 2025

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Roseola infantum is a disease characterized by a fever, followed by a rash after the fever subsides. This disease is caused by an infection with human herpesvirus type 6 or type 7. Typically, it starts with a fever lasting three to five days, which can be moderately high. Generally, a rash appears after the fever subsides, primarily on the torso but it can also spread to the limbs. The rash usually fades within about two days and leaves no scars once it has disappeared.

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Written by Yan Xin Liang

Pediatrics

46sec

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How many days does the rash usually subside in young children with sudden onset?

How many days does it take for infantile roseola to fade? Typically, infants with roseola may experience a fever for three to five days, followed by the appearance of the rash, which usually lasts about three days. After the rash fully emerges, it will gradually fade away. Therefore, the rash from infantile roseola might appear as red, rose-like rashes, spreading across various parts of the body. It usually starts to subside slowly after 2 to 3 days, leaving no marks or skin scars. Unlike measles, where the skin can feel rough, pitted, or flaky after the rash subsides, the skin surface after recovering from roseola is very smooth, leaving no traces.

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Written by Li Jiao Yan

Neonatology

59sec

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Can children with roseola be exposed to wind?

Roseola infantum is a common febrile rash disease in toddlers, primarily affecting infants under three years of age, with the general peak incidence at six to seven months. It is usually caused by a viral infection. During the period of roseola, the baby's immune system is weak. Exposure to drafts can lead to catching a cold and may coincide with other viral and bacterial infections, potentially causing discomfort such as coughing, nasal congestion, runny nose, vomiting, diarrhea, etc. Therefore, during the period of roseola, try to avoid taking the baby to crowded places or drafts, or going out in cold weather, and pay attention to caregiving. When their immunity is weak, avoid exposure to cold. Thus, it is best to keep the baby from being exposed to drafts during roseola.

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Written by Li Jiao Yan

Neonatology

1min 33sec

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How should one handle roseola in toddlers?

Infantile roseola is a common febrile rash illness in infants, the main manifestation of which is high fever lasting for three to five days. When the fever subsides, a maculopapular rash appears on the skin. During the illness, it is important to ensure that the room is well-ventilated and to avoid taking the child to crowded places to prevent worsening of the condition due to cross-infection. Additionally, if the child has a high fever or feels unwell, appropriate fever-reducing treatments should be given. If physical cooling is not effective, suitable antipyretic medicine should be administered. Also, the child should not wear too many clothes or be covered with thick blankets during the fever to avoid impairing heat dissipation. If the child sweats a lot when the fever subsides, be sure to change their clothes promptly to prevent catching cold. During the illness, the child should drink plenty of water, preferably warm. As for diet, it is important to consume light and easily digestible food and properly supplement with vitamin C. If breastfeeding, the mother should be cautious not to consume spicy and greasy food since the baby's gastrointestinal tract is relatively weak during illness. If the mother's diet is too spicy or greasy, it could potentially exacerbate the baby's gastrointestinal burden, leading to diarrhea or vomiting.

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Written by Li Jiao Yan

Neonatology

56sec

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How long does vomiting last in children with sudden rash?

Roseola in infants is a common febrile rash disease in toddlers, generally caused by a viral infection. The primary clinical manifestations of roseola include high fever lasting 3-5 days. Typically, rash develops as the fever subsides or after the fever has resolved. Some children may also experience other symptoms, such as coughing, nasal congestion, runny nose, and sometimes vomiting or diarrhea. Roseola is generally a self-limiting disease; the rash and other symptoms usually disappear gradually after the fever resolves. However, if roseola is accompanied by other viral or bacterial infections, the duration of the illness or symptoms may be prolonged. Since each child is different, the duration of symptoms like vomiting in roseola varies from one child to another, and there is no specific timeframe.

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Written by Yao Li Qin

Pediatrics

1min 28sec

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Early signs of rash in toddlers

Roseola infantum is a common pediatric febrile rash disease caused by viral infection. There are no specific warning signs before the rash appears in roseola. If it is roseola, the child will definitely have a fever for 3-4 days, followed by the disappearance of the fever as the rash appears. However, one characteristic of children with roseola in emergency situations is that although they have a persistent high fever, as long as their temperature drops below 38.5°C, they generally remain in good spirits and usually do not show other symptoms such as runny nose, sneezing, or coughing. This means that if a child between four months and two years old suddenly develops a fever and maintains good spirits, and the fever persists for almost two to three days without subsiding, we need to be highly alert to the possibility of roseola. At this point, parents should not panic; just wait it out for over 72 hours. If the child's temperature suddenly drops and a rash appears, this confirms roseola. If this rash does not appear, then it is not roseola. This means that there aren't any specific symptoms to look for before the rash in roseola; the diagnosis is mainly based on clinical presentation and the doctor's clinical experience.