Papulosquamous (Psoriasis, Lichen)
Pityriasis Rosea
WHAT IS IT
A self-limited rash, likely viral
HOW COMMON
Common, often in teens & young adults
CONTAGIOUS?
No (or very low) — spread is not a real concern
CURABLE?
Yes — clears on its own in 6–8 weeks
What Is It?
Pityriasis rosea is a common, harmless rash that often starts with a single larger "herald patch," followed a week or two later by many smaller oval patches on the trunk. The smaller patches can form a "Christmas tree" pattern on the back. It clears on its own, usually within 6–8 weeks.
Signs & Symptoms
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A single larger "herald patch" to start
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Many smaller pink, oval, scaly patches
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A "Christmas tree" pattern on the back
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Mild to moderate itching
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Mainly on the trunk, upper arms, and thighs
Why Does It Happen?
The exact cause isn't certain, but it's thought to be linked to a common virus (from the herpesvirus family, not the type that causes cold sores or genital herpes). It is not considered meaningfully contagious. It is NOT an allergy and NOT caused by poor hygiene.
Treatment Options
Because it resolves on its own, treatment focuses on comfort and easing itch. No treatment is needed to cure it, but symptoms can be managed.
REASSURANCE
The main step — it clears on its own within 6–8 weeks.
MOISTURIZERS / ANTIHISTAMINES
Soothe dryness and reduce itch.
TOPICAL STEROIDS
Calm itch and inflammation if bothersome.
GENTLE SUN / LIGHT
Modest sun exposure sometimes helps the rash fade.
Tips for Managing It at Home
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Use lukewarm (not hot) showers to reduce itch
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Apply gentle, fragrance-free moisturizers
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Wear soft, breathable clothing over the rash
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Be reassured — this is temporary and heals without scars
When to Call Your Provider
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The rash lasts longer than about 3 months
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You are pregnant (let your provider know)
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Severe itching or the rash keeps you from sleeping
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The pattern is unusual, blistering, or involves palms/soles
Sources & further reading
The information in this handout is based on general dermatology guidance from the reputable organizations below. These links are provided for patients who wish to read more from trusted sources.
American Academy of Dermatology (AAD). Pityriasis Rosea. https://www.aad.org/public/diseases/a-z/pityriasis-rosea
DermNet. Pityriasis Rosea. https://dermnetnz.org/topics/pityriasis-rosea
MSD/Merck Manual. Pityriasis Rosea. https://www.msdmanuals.com/professional/dermatologic-disorders/psoriasis-and-scaling-diseases/pityriasis-rosea
This handout is for general education and does not replace advice from your own provider. Always follow your provider’s specific instructions.
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