Chickenpox (Varicella): A Parent's Guide to Symptoms and Care

What Is Chickenpox?

Chickenpox (varicella) is a highly contagious infection caused by the varicella-zoster virus (VZV). Before the vaccine was introduced, nearly 90% of unvaccinated children caught it — usually between ages 3 and 10. Today, routine vaccination has cut cases by over 90% in vaccinated populations. The virus spreads easily through the air when an infected person coughs or sneezes, and also by touching chickenpox blisters. If your unvaccinated child is exposed to someone with chickenpox, there is more than a 90% chance they will get it.

What Are the Signs and Symptoms?

Chickenpox unfolds in a predictable pattern:

• Days 1-2 (prodrome): Fever (usually 38-39°C / 100-102°F), tiredness, headache, and loss of appetite. Your child may seem "off" before the rash appears.
• Days 2-3 (rash begins): Small red spots appear first on the face and trunk, then spread to the arms and legs. Within hours, each spot becomes a raised bump, then a fluid-filled blister (the classic "dewdrop on a rose petal" appearance).
• Days 3-5 (peak rash): Blisters crust over. New spots keep appearing while old ones crust — this is normal. The itching is typically intense. Some children also develop spots inside the mouth.
• Days 5-10 (recovery): All spots crust over. Fever usually resolves by day 3-4. Most children feel much better by day 7-10.

What Causes the Rash Pattern?

The chickenpox virus travels through the bloodstream to the skin, which is why spots appear all over the body rather than in one place. The telltale sign is seeing spots in different stages at the same time — some still flat and red, others blistered, others already crusted. This mixed picture is a hallmark of chickenpox that helps doctors distinguish it from other rashes.

How Is It Treated?

Home care for most children: Supportive care is all that's needed for healthy children. Keep your child comfortable, maintain hydration, and manage the itch.

• For fever: Acetaminophen at 15 mg/kg per dose every 4-6 hours. Never exceed 5 doses in 24 hours. Do not use ibuprofen — it is linked to serious invasive bacterial skin infections in children with chickenpox.
• For itch: Oatmeal baths, cool compresses, and calamine lotion can help. Keep fingernails trimmed short to prevent scratching.
• For fluid: Encourage plenty of fluids, especially if mouth sores make drinking uncomfortable.

Antiviral medication (acyclovir or valacyclovir): These are most helpful if started within 24 hours of the rash appearing. For healthy children, antiviral treatment shortens the illness by about 1-2 days and reduces the number of spots. Doctors particularly recommend it for children over 12 months if treatment can begin quickly, adolescents (who tend to have more severe illness), and children at higher risk. Ask your doctor at the first sign of rash whether antiviral treatment is right for your child.

Antiviral medication is strongly recommended for: Immunocompromised children, newborns exposed to varicella, teenagers and adults, and anyone with severe or complicated disease.

When to Keep Your Child Home

Children with chickenpox are contagious from about 1-2 days before the rash appears until all spots have crusted over — usually 5-7 days after the rash begins. Most schools and daycares require all spots to be crusted before a child can return. Once every spot is crusted, your child is no longer contagious through the air.

When to See a Dermatologist or Doctor

• Any spot that becomes very red, swollen, warm, or starts draining yellow pus — this may be a bacterial skin infection (impetigo or cellulitis), which occurs in 5-10% of cases and needs antibiotic treatment.
• Your child develops difficulty breathing, chest pain, or a persistent cough — could indicate varicella pneumonia.
• Your child becomes confused, has a severe headache, or has a seizure — rare but serious complications affecting the brain.
• Fever returns after several days of improvement.
• Your child is immunocompromised or on steroid medications — needs close monitoring and possibly IV antiviral treatment.
• A newborn is exposed to chickenpox — infants under 4 weeks are at high risk and need prompt evaluation.

I heard you should never give ibuprofen with chickenpox. Is that true?

Yes — this is an important safety point. Ibuprofen (Advil, Motrin) has been linked to a significantly higher rate of invasive Group A Streptococcus skin infections in children with chickenpox. These can be very serious and even life-threatening. Stick to acetaminophen (Tylenol) for fever and pain during chickenpox.

My child has been vaccinated. Can they still get chickenpox?

Yes, but it will usually be much milder. Vaccinated children who get chickenpox (called breakthrough varicella) typically have fewer than 50 spots, little or no fever, and recover faster. The vaccine is still very worthwhile — it prevents severe disease and complications even when it doesn't prevent infection entirely. Two doses of the vaccine provide better protection than one.

I'm pregnant and my child has chickenpox. Should I be worried?

If you've had chickenpox before or received the vaccine, you are almost certainly immune and your baby is protected. If you are unsure of your immunity, contact your obstetrician right away. Chickenpox during pregnancy — especially in the first or second trimester — can rarely cause birth defects, and infection near delivery can be dangerous for the newborn.

Can chickenpox come back later in life?

The varicella-zoster virus stays dormant (inactive) in your nervous system for life after a chickenpox infection. In adulthood — especially if the immune system is weakened by age or illness — it can reactivate as shingles (herpes zoster). Shingles causes a painful, blistery rash, usually on one side of the body. A shingles vaccine is available and recommended for adults over 50.

Trusted Resources

• American Academy of Dermatology: Chickenpox
• CDC: Varicella (Chickenpox)
• Mayo Clinic: Chickenpox

Always consult a board-certified dermatologist for diagnosis and treatment recommendations specific to your child's condition.