Scarlet fever in babies and toddlers: what it looks like and what to do
Hearing your child has scarlet fever can feel alarming, but this is a well-understood bacterial infection with a reliable treatment. The key is recognising it quickly and starting antibiotics as soon as a doctor confirms the diagnosis. This guide explains what to look for, what the rash and tongue changes actually feel and look like, why completing the full course of antibiotics matters, and exactly when to call for help.
What scarlet fever is
Scarlet fever is a bacterial infection caused by group A Streptococcus bacteria, the same bacteria responsible for strep throat. The infection produces a toxin that causes the characteristic rash and tongue changes that distinguish scarlet fever from other illnesses.
It is most common in children aged two to eight years, but it can affect babies and toddlers too. In recent years the UK has seen a significant rise in scarlet fever cases; the UK Health Security Agency (UKHSA) monitors reported cases closely and issues guidance to nurseries and schools when outbreaks occur.
The important thing to know is that scarlet fever is treatable with antibiotics and most children recover fully, usually within a week of starting treatment.
Typical symptoms and how they unfold
Scarlet fever tends to come on quickly. The illness usually begins with a sudden fever of 38C or above, alongside a sore throat and sometimes vomiting. Your child may also have swollen glands in the neck, a headache, and general aches that make them feel quite unwell from the start.
The characteristic rash usually appears 12 to 48 hours after the fever begins, so in the very early stages your child may simply seem to have a bad sore throat. The rash starts on the neck and spreads to the chest, back, arms and legs over the next day or two. The face typically looks flushed and red, except for a pale area of skin around the mouth.
If you notice a sudden fever with a sore throat in a young child, it is worth contacting your GP or 111 even before a rash appears, particularly if other children in the nursery or playgroup have recently been diagnosed.
What the rash looks and feels like
The rash of scarlet fever is distinctive once you know what you are looking for. It is made up of thousands of tiny, raised spots that sit close together, making the skin feel rough to the touch, like sandpaper when you run a finger across it. This sandpaper texture is one of the most reliable signs.
From a distance, the rash looks red or pink and may resemble a bad sunburn. The skin in the skin folds, such as the armpits, elbows and groin, can look especially deep red.
There is usually a pale area of skin around the mouth (called circumoral pallor) even while the rest of the face is flushed and rosy. This contrast can look quite striking.
One reassuring test: press firmly on the rash with a glass or a finger. The rash should blanch (fade to pale) under pressure and return to red when you release. This blanching response is a good sign and helps distinguish scarlet fever from the non-blanching rash associated with meningitis, which does not fade under pressure.
After the illness passes, the skin often peels, particularly on the hands and feet and sometimes around the groin. This peeling can last a week or two but is completely normal and not harmful.
Strawberry tongue
One of the most distinctive features of scarlet fever is what doctors call the "strawberry tongue," and it tends to change in a predictable sequence over the first few days of the illness.
In the first day or two, the tongue may develop a white coating with red bumps showing through underneath. After a few days, the white coating peels away to reveal a bright red, bumpy tongue that looks strikingly like a strawberry.
This is not dangerous and it does not require any specific treatment beyond the antibiotics your child will already be taking. The tongue returns to its normal appearance as the infection clears. Seeing it can be helpful for confirming the diagnosis, so if you notice it, mention it to the doctor.
Why antibiotics are essential
Scarlet fever must be treated with a course of antibiotics. The usual prescription is penicillin or amoxicillin for 10 days. If your child is allergic to penicillin, the doctor will prescribe a suitable alternative.
Antibiotics do several important things: they reduce the severity and length of the illness, bring the fever down faster, reduce the risk of passing the infection to others, and most importantly, prevent serious complications. Your child will generally start to feel better within one to two days of starting antibiotics.
Do not stop the antibiotics early, even if your child seems much better after three or four days. The full 10-day course is needed to clear the infection completely. Stopping early can allow the bacteria to survive and lead to a relapse.
If untreated, scarlet fever can occasionally lead to serious complications. Rheumatic fever is a condition that can develop a few weeks after an untreated streptococcal infection and can damage the heart valves. Post-streptococcal glomerulonephritis is a kidney condition that can also follow an untreated infection. Both of these complications are rare and largely preventable with prompt antibiotic treatment, which is another reason not to delay calling your GP.
When to call 999 or go to A&E
Most children with scarlet fever can be assessed and treated in a GP setting without needing emergency care. However, some signs require immediate action.
Call 999 or go to A&E immediately if your child has difficulty breathing or is breathing very fast. Call 999 if your child has severe neck stiffness, seems confused, or is very difficult to rouse from sleep. Call 999 if your child develops a rash that does not fade when you press a glass firmly against the skin, as this non-blanching rash needs immediate assessment to rule out a more serious cause.
Call your GP or 111 the same day if you think your child has scarlet fever. They need to be seen by a doctor, and antibiotics should start promptly. Do not wait for the rash to fully develop before making that call.
When your child can return to nursery or school
The standard guidance from Public Health England and the UKHSA is that children with scarlet fever can return to nursery or school 24 hours after starting antibiotics, as long as they feel well enough to attend. They do not need to be symptom-free.
Let the nursery or school know about the diagnosis when you call to report the absence, so that staff can keep an eye out for symptoms in other children and inform parents if needed. Scarlet fever is a notifiable disease in the UK, which means your GP may also need to report the case to the local health protection team.
Preventing spread within your household
Scarlet fever spreads through respiratory droplets when an infected person coughs or sneezes, and through contact with contaminated surfaces. Good hand hygiene is the most effective way to reduce transmission within the home. Encourage regular handwashing, especially before eating and after blowing the nose, and avoid sharing cups, cutlery or towels while your child is unwell.
If two or more cases occur in the same childcare setting within a short period, the nursery should inform the local health protection team, who can advise on further steps.
Other household members who develop a sore throat in the days following your child's diagnosis should be assessed by a GP or via 111. They may also need to be tested or treated, particularly if they are in a higher-risk group.
Frequently asked questions
Is scarlet fever serious?
Scarlet fever is a bacterial infection that needs antibiotic treatment, but it is not usually dangerous when treated promptly. Without antibiotics, there is a small risk of serious complications such as rheumatic fever and kidney disease. With a full course of antibiotics, most children recover completely within a week and go on without any lasting effects.
How quickly do antibiotics work for scarlet fever?
Most children start to feel better within 24 to 48 hours of starting antibiotics. The fever usually drops within the first day or two and the rash gradually fades over the following days. It is important to complete the full 10-day course even if your child feels well sooner, to clear the infection fully and prevent complications.
When can my baby go back to nursery after scarlet fever?
Your child can return to nursery or school 24 hours after starting antibiotics, provided they feel well enough to attend. Let the nursery know about the diagnosis so staff can monitor other children for symptoms and alert other families if needed.
Is scarlet fever the same as strep throat?
Both scarlet fever and strep throat are caused by the same bacteria, group A Streptococcus. The key difference is that scarlet fever produces a distinctive skin rash, a strawberry tongue and sometimes circumoral pallor, while strep throat does not. Both conditions are treated with antibiotics, usually the same antibiotic for the same length of time.
What does the scarlet fever rash feel like?
The rash of scarlet fever is made up of tiny raised bumps that make the skin feel rough, like sandpaper when you run your finger over it. It looks red or pink from a distance and may resemble a bad sunburn. The rash blanches (fades) when pressed, which is a reassuring sign. After the illness the skin often peels, particularly on the hands and feet, which is normal and harmless.
How do I know if my baby has scarlet fever and not another illness?
The combination of a sudden fever, sore throat, sandpaper-textured rash and strawberry tongue is fairly distinctive. However, the diagnosis should always be confirmed by a doctor rather than at home. If you think your child might have scarlet fever, call your GP or 111 the same day so they can be examined and start antibiotics if needed. Do not wait to see whether the rash develops further before seeking advice.
Track symptoms in Cubby while you wait for the doctor
Log your baby's temperature, rash appearance and symptoms so you can describe them clearly when you call.
Start free