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Pityriasis rosea

Also called: Pityriasis rosea, Christmas tree rash

A harmless rash that starts with one larger oval patch (herald patch), followed by smaller patches on the trunk in a Christmas-tree pattern. It goes away on its own in 6 to 8 weeks.

Starts withOne herald patch
Lasts6 to 8 weeks
ContagiousNot really

Overview

It may follow a mild cold and is thought to be linked to a virus.

Syphilis can look similar, so a clinician may test if unsure. In pregnancy, tell your doctor.

Symptoms

Common signs:

  • Oval scaly patches on the trunk
  • One oval patch, then a rash on the chest and back

Less common

  • Herald patch
  • Itching

Look up a symptom: Itching · One oval patch, then a rash on the chest and back · Rash

When to get medical care

Call 911This isn't an emergency by itself. Call 911 for trouble breathing, chest pain, or fainting.
Get care todayRash with fever or blisters.
See a doctor soonRash lasting more than 3 months, or during pregnancy.

Causes

Likely viral.

Does it spread or run in families?

  • It isn't contagious. You can't catch it from someone else.

Who is more likely to get it

  • Ages 10 to 35

Diagnosis

A clinician can usually tell by looking.

Questions you may be asked

  • New medicines
  • Pregnancy

Tests

Tests, if needed:

  • Blood test: Sometimes, for syphilis.

Treatment

Ease the itch while it fades.

Self-care

  • Take lukewarm showers
  • Use fragrance-free moisturizer
  • A little sun may speed fading

Medicines

Medicines that may help:

MedicineHelps withGood to know
Anti-itch
Itch

OwieClear doesn't give doses: follow the label or your healthcare professional. Medicine names here are examples, not a full list.

Prevention

It can't be prevented.

Which doctor treats this

  • Start with your primary care provider (family doctor or internist).
  • They may send you to a dermatologist (skin doctor).

Back to school, work, or sports

  • Most people keep up normal school and work. Rest when you need to.

Pregnancy and breastfeeding

  • If you're pregnant or planning to be, tell your prenatal provider about this condition.
  • Don't start or stop any medicine on your own. Some are safe in pregnancy and some need to be changed.
  • Ask before taking any pain reliever. The FDA advises avoiding ibuprofen and naproxen after 20 weeks unless your doctor says to.
  • Breastfeeding: Most medicines are fine, but ask. The NIH LactMed database lists what's known about each one.

Outlook

Clears without scars.

Research studies

Research studies test new ways to find and treat health problems. Some are looking for volunteers. Talk with your doctor before joining one.

Search ClinicalTrials.gov for studies on Pityriasis rosea

Sources

Last updated 2026-11-12.