Pityriasis Rosea

Pityriasis Rosea

Overview

Pityriasis rosea is a common, self-limiting skin condition that typically begins with a single large, scaly patch called a herald patch, followed 1–2 weeks later by a widespread rash of smaller oval patches arranged in a Christmas tree pattern on the trunk. It is thought to be triggered by a viral infection (HHV-6 or HHV-7).

Key Symptoms

• Initial herald patch: large (2–10 cm), oval, pink, scaly patch
• Subsequent eruption of smaller oval patches on the trunk and proximal limbs
• Patches follow skin cleavage lines in a Christmas tree pattern on the back
• Fine collarette of scale within the lesions
• Mild to moderate itching in about half of cases
• May be preceded by mild upper respiratory symptoms

Affected Areas

Trunk, Back, Chest, Upper arms, Thighs

Care Instructions

1. No treatment is usually necessary as the rash resolves on its own in 6–10 weeks.
2. Antihistamines and topical corticosteroids can relieve itching.
3. Moisturizers and lukewarm oatmeal baths may soothe the skin.
4. Avoid hot showers and harsh soaps, which can worsen itching.
5. See a dermatologist to confirm the diagnosis and rule out other conditions.
6. Pityriasis rosea rarely recurs and is not contagious.

Medical Disclaimer: This information is for educational purposes only and does not replace professional medical advice. Always consult a qualified dermatologist for diagnosis and treatment.

Prevalence: Common; affects approximately 0.5–2% of the population, most commonly in ages 10–35