Chickenpox (Varicella): Symptoms, Home Care, and When to Call the Doctor

Chickenpox—caused by the varicella-zoster virus (VZV)—is highly contagious via respiratory droplets and direct vesicle fluid contact. Since routine vaccination (1995 US), incidence dropped >90%, but breakthrough cases and unvaccinated clusters still occur. Here's the practical guide.

Typical Clinical Course

• Incubation: 10–21 days (avg 14–16) post-exposure.
• Prodrome (1–2 days): Low-grade fever, malaise, headache, anorexia.
• Rash evolution: Starts trunk → spreads centrifugally to face, scalp, extremities (including palms/soles).
  Macule → Papule → Vesicle (dew drop on rose petal) → Pustule → Crust over 5–7 days.
  Crops appear in waves — lesions at all stages simultaneously (key diagnostic feature).
• Contagious period: 1–2 days before rash until all lesions crusted (~5–7 days after onset).

Symptomatic Treatment (Supportive Care)

• Itch control: Oral antihistamine (cetirizine 10mg daily, diphenhydramine q6h PRN — sedation helps sleep). Topical: calamine lotion, colloidal oatmeal baths (Aveeno), 0.25% menthol/phenol lotion, cool compresses.
• Fever/discomfort: Acetaminophen (weight-based dosing). NO ASPIRIN — Reye's syndrome risk (hepatic encephalopathy + cerebral edema).
• Hydration: Water, electrolyte solutions, popsicles. Avoid acidic/juice (stings oral lesions).
• Oral lesions: Magic mouthwash (lidocaine/maalox/diphenhydramine) or cool soft foods.
• Infection prevention: Trim nails short; mittens/socks on hands for infants; daily bathing (gentle).
• Isolation: Home until all lesions crusted. Notify school/daycare.

Prevention

• Two-dose varicella vaccine: 12–15 months, 4–6 years. ≥90% effective against any disease; ~100% against severe.
• Post-exposure prophylaxis: Vaccine within 72 hours (up to 5 days) reduces severity/incidence. VariZIG (VZV immune globulin) for high-risk exposed (immunocompromised, pregnant, neonates) within 10 days.

Red Flags — Call Doctor Immediately

• Fever >38.9°C (102°F) or fever >4 days
• Severe headache, stiff neck, photophobia (meningitis/encephalitis)
• Infected lesions: spreading erythema, warmth, pus, red streaks (cellulitis, sepsis)
• Respiratory distress, persistent vomiting, seizures, altered mental status
• Immunocompromised patient (chemo, steroids, HIV, transplant)
• Pregnant woman exposed (congenital varicella syndrome risk)
• Neonate exposed (maternal onset 5 days before–2 days after delivery)

Special Populations

• Adults: More severe, higher complication rate (pneumonia, encephalitis). Antivirals (acyclovir/valacyclovir) recommended if started <24 hrs rash onset.
• Pregnancy: Congenital varicella syndrome (1st/2nd tri): limb hypoplasia, microcephaly, eye defects, skin scarring. Neonatal varicella (peripartum): 20–30% mortality without treatment.
• Immunocompromised: Disseminated disease, visceral involvement, hemorrhage. IV acyclovir often needed.

Chickenpox is usually self-limited in healthy children. But "usually" isn't "always." Vaccinate. Recognize red flags. Act fast when they appear.