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Pimple-like bumps that turn into blisters or scabs

Also called: Chickenpox, varicella, shingles

Itchy, pimple-like bumps that turn into blisters and then scabs are a classic sign of chickenpox. Shingles causes a similar rash in a band on one side of the body. Both come from the same virus. Vaccines prevent them.

Common causesChickenpox, shingles
Usually serious?Usually not
Get checked ifRash near the eye, high fever, or weak immune system
If you think it's an emergency, call 911.Thinking about suicide? Call or text 988.

Overview

Chickenpox spreads easily and causes fever and an itchy rash that comes in waves.

Shingles is the chickenpox virus waking up later, causing a painful rash on one side.

When to get medical care

Call 911Trouble breathing, stiff neck, confusion.
Get care todayRash near the eye. Infected blisters. Pregnancy or weak immune system.
See a doctor soonAny shingles rash (treatment works best early).

Causes

Causes include chickenpox, shingles, impetigo, and hand, foot, and mouth disease.

OwieClear has pages on 2 conditions that can cause pimple-like bumps that turn into blisters or scabs. Each shows how soon to get care.

Common causes

  • MpoxSee a doctor if it doesn't get better

    A virus that causes a rash of bumps that turn into blisters and scabs, often on the genitals, anus, or mouth, along with fever, swollen glands, and aches.

  • Smallpox and related poxvirusesMay need emergency care

    A deadly virus that was eliminated worldwide in 1980.

What you can do at home

  • Use calamine lotion.
  • Take oatmeal baths.
  • Stay home until blisters crust.

Medicines

Antivirals help shingles and some chickenpox cases. Don't give aspirin to children.

At the doctor

Usually diagnosed by the rash.

Questions you may be asked

  • Rash pattern
  • Vaccine history

The exam

A skin exam.

Tests

  • Swab test if unclear

Prevention

Get vaccinated.

  • Chickenpox vaccine
  • Shingles vaccine

Check your symptoms

Most symptoms have more than one possible cause. The symptom checker looks at all of your symptoms together, plus your age, and shows how soon to get care.

Start the symptom checker

Sources

Last updated 2026-11-13.