Quick answer. Scarlet fever is a bacterial infection, mainly in children, that causes a sore throat, fever and a fine, sandpaper-like red rash, often with a ‘strawberry tongue’. It is treated effectively with antibiotics, which also reduce the small risk of complications, so see a doctor if you suspect it.
Scarlet fever is a childhood infection caused by the same group of bacteria (group A streptococcus) that cause strep throat. It typically brings a sore throat and fever, followed by a distinctive fine red rash that feels like sandpaper, and sometimes a reddened, bumpy ‘strawberry tongue’. While the name sounds alarming, scarlet fever today is usually a mild illness that responds well to antibiotics.
This guide explains what scarlet fever looks like, why it happens, how it is diagnosed and treated, and when to seek help. The key message for parents in Singapore is that scarlet fever is treatable and that prompt antibiotic treatment both speeds recovery and lowers the small chance of complications. If you think your child may have it, see a doctor for assessment rather than waiting it out.
At a glance
| Feature | What it looks or feels like | Notes |
|---|---|---|
| Early symptoms | Sore throat, fever, headache, sometimes nausea | Often the first signs, before the rash |
| The rash | Fine, red, sandpaper-like, starting on the chest then spreading | May be harder to see on darker skin; feels rough to touch |
| The tongue | White coating, then red and bumpy ('strawberry tongue') | A characteristic sign |
| The face | Flushed cheeks, pale area around the mouth | Common pattern |
| After recovery | Skin may peel, especially on fingertips and toes | Happens as the rash fades |
What is scarlet fever?
Scarlet fever is an infection caused by group A streptococcus bacteria, the same bacteria responsible for many cases of strep throat. The bacteria produce a toxin that causes the characteristic red rash. It mainly affects children, most often between about two and ten years of age, though anyone can get it.
It used to be a feared illness, but with modern antibiotics it is now usually mild and complications are uncommon. It does tend to come in waves and outbreaks, and because it is contagious it can spread within families, childcare centres and schools. In Singapore it is one of the recognisable childhood infections, and recovery is the norm with proper treatment.
Symptoms & signs
The typical features of scarlet fever include:
- A sore throat and fever, often the first symptoms
- Headache, swollen neck glands, and sometimes nausea or vomiting
- A fine red rash that feels like sandpaper, usually starting on the chest or tummy and spreading to the rest of the body; it may be harder to see on darker skin but still feels rough
- Flushed cheeks with a pale area around the mouth
- A white coating on the tongue that peels to leave the tongue red, swollen and bumpy – the so-called ‘strawberry tongue’
- Peeling of the skin, especially on the fingertips and toes, as the rash settles
The symptoms usually appear a few days after exposure to the bacteria.
Causes & risk factors
Scarlet fever is caused by group A streptococcus bacteria and spreads easily from person to person:
- Through droplets from coughs and sneezes
- By touching surfaces, cups, cutlery or towels used by an infected person and then touching the mouth or nose
- Through contact with infected skin sores
Children of primary-school age are most commonly affected, and close-contact settings like childcare and schools make it easier to spread. Good hand hygiene, covering coughs and sneezes, and not sharing cups and cutlery help reduce transmission. A person with scarlet fever is usually no longer contagious about 24 hours after starting antibiotics.
How it's diagnosed
A doctor can often recognise scarlet fever from the combination of a sore throat, fever and the characteristic sandpaper rash and strawberry tongue. To confirm a streptococcal infection, the doctor may take a throat swab, and in some clinics a rapid strep test can give a quick result.
Confirming the diagnosis matters because scarlet fever is treated with antibiotics, and identifying the bacteria helps ensure the right treatment. If your child has a sore throat with a rash, it is best to have them seen rather than guessing, as the rash can be confused with other viral rashes.
Treatment options
Scarlet fever is treated with a course of antibiotics, usually penicillin or, for those allergic to penicillin, an alternative prescribed by the doctor. Antibiotics help your child recover faster, reduce how long they are contagious, and lower the small risk of complications. It is important to:
- Complete the full course of antibiotics even if your child feels better
- Keep your child at home and away from others until at least 24 hours after starting antibiotics and until they feel well
- Use paracetamol (or ibuprofen if suitable) for fever and discomfort, following dosing advice
- Offer plenty of fluids and soft foods if the throat is sore
Most children improve within a few days of starting antibiotics. Without treatment, scarlet fever can occasionally lead to complications such as ear infections, abscesses or, rarely, problems affecting the heart or kidneys, which is why treatment is recommended.
When to see a doctor & which specialist
See a doctor if you think your child has scarlet fever – a sore throat with fever and a fine red rash – so they can be assessed and started on antibiotics if needed. Also see a doctor if your child is not improving within a few days of starting antibiotics, or seems to be getting worse.
Seek urgent care, or call 995, if your child has difficulty breathing or swallowing, is drooling and unable to swallow saliva, appears very unwell, drowsy or floppy, shows signs of dehydration, or develops a rash that does not fade when pressed with a glass. For diagnosis and treatment of scarlet fever, your first port of call is a GP or family doctor, who can examine your child, take a swab and prescribe antibiotics, and refer to a paediatrician if necessary. You can find one through our directory of the best GP clinics in Singapore.
Related guides
- Best Paediatric Clinics in Singapore — our editorial shortlist
- paediatric clinics directory
- Kidney cancer
- Roseola
- Baby reflux
- Oral cancer
- Polymyalgia rheumatica
Sources
- NHS – Scarlet fever
- Mayo Clinic – Scarlet fever
- HealthHub Singapore – Diseases and conditions
- KK Women's and Children's Hospital
Find a specialist
Prefer a named doctor? See our independent, sub-specialty-grouped directory of paediatricians in Singapore.
Part of our Children’s health guides · Browse all health topics