The Bottom Line

Scarlet fever is a strep throat infection that produces a distinctive red, sandpaper-textured rash across the body. It most commonly affects children 5–12 years old and is very contagious. While it sounds alarming — and was historically dangerous — today's scarlet fever almost always responds well to antibiotics within days. The most important reason to treat it promptly is not the rash itself, but preventing rare but serious complications like rheumatic fever, which can damage the heart. If your child has a sore throat, fever, and a rough red rash that appeared within 1–2 days, call your doctor.

What Is Scarlet Fever?

Scarlet fever (also called scarlatina) is caused by Group A Streptococcus — the same bacteria responsible for strep throat. Certain strains of this bacteria produce toxins called streptococcal pyrogenic exotoxins (SPEs). These toxins act like an alarm system gone haywire, triggering a massive immune response that causes the characteristic widespread rash and systemic symptoms.

Despite its scary-sounding name, modern scarlet fever is almost always a mild to moderate illness with antibiotic treatment. The condition was once a leading cause of childhood death, but improved living conditions, antibiotic access, and changes in bacterial strains have made it far less dangerous today. That said, it should not be ignored — untreated strep infection still carries real risks.

What Are the Signs and Symptoms?

Scarlet fever usually starts with strep throat symptoms, then the rash appears 12–48 hours later:

  • Day 1–2: Strep symptoms come first
    • Sudden fever (often 101–104°F / 38.3–40°C)
    • Sore throat — often severe, with red, swollen tonsils
    • Headache, stomach ache, or vomiting
    • Swollen lymph nodes in the neck
  • Day 1–2: The distinctive rash appears
    • Starts on the neck and chest, spreads to the trunk and limbs
    • Fine, red, bumpy texture — feels like sandpaper when you run your hand over it
    • Blanches (turns pale) when pressed
    • May be mildly itchy
  • Classic additional features:
    • Pastia's lines: Bright red lines in the skin folds — armpits, elbows, groin
    • Flushed face with pale ring around the mouth (circumoral pallor) — the lips appear white in comparison
    • Strawberry tongue: The tongue first looks white with red bumps, then the coating peels away to reveal a bright red, bumpy surface
  • After the rash fades (5–7 days): Fine skin peeling often occurs, especially on the palms and soles — similar to peeling after a sunburn

Is Scarlet Fever Contagious?

Yes — very. Scarlet fever spreads through respiratory droplets when an infected person coughs or sneezes. It can also spread through direct contact with infected wounds or contaminated food. Untreated children remain contagious for about 2 weeks. Once antibiotic treatment begins, they are typically no longer contagious after 24–48 hours. Most pediatricians recommend keeping a child home from school until they've been on antibiotics for at least 24 hours and are fever-free.

Why Is Prompt Treatment So Important?

Antibiotics clear up the infection and the rash quickly. But the most important reason to treat scarlet fever promptly is to prevent rare but serious complications from untreated strep infection:

  • Acute rheumatic fever (ARF): Occurs in 3–10% of untreated strep pharyngitis cases. ARF can permanently damage heart valves (rheumatic heart disease) — a serious, lifelong consequence that is almost entirely preventable with early antibiotic treatment.
  • Post-streptococcal glomerulonephritis: Kidney inflammation that can follow untreated strep skin infections (about 10–15% of cases), causing blood in the urine, swelling, and high blood pressure.
  • Ear infections, sinus infections, or spread of the bacteria to deeper tissues

These complications are rare when treatment is given promptly — which is exactly why early diagnosis matters.

How Is Scarlet Fever Diagnosed?

Your doctor will examine your child's throat, look at the rash, and typically perform a rapid strep test (a quick throat swab). Results come back in about 10 minutes. If the rapid test is negative but scarlet fever is strongly suspected, a throat culture may be sent to the lab for confirmation.

Treatment

  • Antibiotics: Penicillin or amoxicillin for 10 days is the standard treatment. In children with penicillin allergy, azithromycin or cephalosporins are alternatives. Complete the full course even if your child feels better quickly — stopping early increases the risk of complications.
  • Fever and pain relief: Acetaminophen (Tylenol) or ibuprofen (Advil, Motrin) help manage fever and sore throat pain.
  • Fluids and rest: Encourage plenty of fluids, especially cool drinks and popsicles that soothe a sore throat.
  • Itching: If the rash itches significantly, a cool wet cloth or an oral antihistamine can help.

Most children feel substantially better within 2–3 days of starting antibiotics. The rash typically fades over 5–7 days. The peeling that follows is harmless and doesn't require any treatment.

When to See a Doctor or Go to the ER

  • Your child has a sore throat and fever, and a sandpaper-like rash — see a doctor the same day
  • Symptoms aren't improving after 2–3 days of antibiotics
  • Your child is having difficulty swallowing or breathing
  • Signs of dehydration: no wet diapers, no tears, very dry mouth
  • After recovery: new swelling, joint pain, or blood in the urine — these could suggest a delayed complication like rheumatic fever or kidney involvement

Frequently Asked Questions

Can you get scarlet fever more than once?

Yes. Unlike chickenpox, immunity to scarlet fever is not permanent. Children can develop scarlet fever multiple times if exposed to different strains of Group A Streptococcus that produce different toxins. Each episode should be treated with antibiotics.

My child's skin is peeling after the rash — is this normal?

Completely normal. Skin peeling on the hands, soles, and sometimes trunk is a classic part of scarlet fever's natural course. It typically begins as the rash fades and can last 1–3 weeks. No special treatment is needed — keep the skin moisturized and let the peeling resolve on its own.

Should other family members take antibiotics?

Generally, asymptomatic household contacts do not need antibiotics unless they are at high risk (for example, someone with a history of rheumatic heart disease). However, if other family members develop a sore throat or similar symptoms, they should be tested for strep. Talk to your doctor about your specific household situation.

How is scarlet fever different from a regular strep throat?

Scarlet fever is simply strep throat caused by a toxin-producing strain of Group A Streptococcus. The rash, strawberry tongue, and skin peeling are what distinguish it from regular strep throat. The treatment is the same — penicillin or amoxicillin — and the prognosis is equally good with prompt treatment.

  1. Shulman ST, et al. Clinical practice guideline for the diagnosis and management of group A streptococcal pharyngitis. Clin Infect Dis. 2012;55(10):1279–1282.
  2. Walker MJ, et al. Disease manifestations and pathogenic mechanisms of Group A Streptococcus. Clin Microbiol Rev. 2014;27(2):264–301.
  3. Carapetis JR, et al. The global burden of group A streptococcal diseases. Lancet Infect Dis. 2005;5(11):685–694.
  4. Steer AC, et al. Scarlet fever in the 21st century. Curr Opin Infect Dis. 2009;22(3):185–191.

Trusted Resources

Always consult a board-certified dermatologist or your child's physician if you suspect scarlet fever or have concerns about a skin rash with fever.