Chickenpox

example of chickenpox

The vesicles of chickenpox can look like water blisters on the skin.

Credit: DermNet NZ

What is chickenpox?

Chickenpox is a highly contagious infectious disease caused by the varicella-zoster virus. It is characterized by an itchy skin rash consisting of red spots and fluid-filled blisters. While it's more common in children, adults can also get chickenpox. Once a person has had chickenpox, the virus remains dormant in their nervous system and can reactivate later in life, leading to shingles.

What causes chickenpox?

Chickenpox is caused by the varicella-zoster virus. It spreads easily primarily through respiratory droplets from an infected person's cough or sneeze. It can also spread by touching or breathing in the virus particles that come from chickenpox blisters.

What are the symptoms of chickenpox?

Chickenpox symptoms usually appear 10 to 21 days after exposure to the virus. They include:

  • Fever and fatigue

  • Loss of appetite

  • Headache

  • Itchy rash that turns into fluid-filled blisters and then scabs

  • Red spots appearing on the face, chest, and back, which spread to other parts of the body

How do I treat chickenpox?

While there's no cure for chickenpox, the disease can be managed with:

  • Antiviral medications, especially in severe cases or for those at risk

  • Calamine lotion and oatmeal baths to relieve itching

  • Over-the-counter pain relievers like acetaminophen or ibuprofen (Note: Aspirin should be avoided in children with chickenpox due to the risk of Reye's syndrome)

  • Keeping nails short to prevent skin infections caused by scratching

How do I prevent chickenpox?

The best prevention for chickenpox is the varicella vaccine, which is typically given in two doses: once between the ages of 12 and 15 months and again between 4 and 6 years. Additionally:

  • Avoid close contact with those infected

  • Maintain good hand hygiene

  • Quarantine infected individuals until all blisters have formed scabs

example of chickenpox on the back

Chickenpox presenting as vesicles with surrounding erythema.

Credit: DermNet NZ

The acute vesicle can be very inflammatory in nature.

An acute vesicle of chickenpox where the surrounding skin is still inflamed and red.

Credit: DermNet NZ

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