Overview

Pityriasis rosea may be a rash that sometimes begins as an outsized circular or oval spot on your chest, abdomen or back. Called a herald patch, this spot are often up to 4 inches (10 centimeters) across.

The herald patch is usually followed by smaller spots that sweep out from the center of your body during a shape that resembles drooping pine-tree branches.

Pityriasis rosea can affect any age group. It most commonly occurs between the ages of 10 and 35. It usually goes away on its own within 10 weeks. Pityriasis rosea can cause itching. Treatment may help relieve the symptoms.

Symptoms

Pityriasis rosea typically begins with an outsized , slightly raised, scaly patch — called the herald patch — on your back, chest or abdomen. Before the herald patch appears, some people experience headache, fatigue, fever or pharyngitis .

A few days to a couple of weeks after the herald patch appears, you'll notice smaller scaly spots across your back, chest or abdomen that resemble a pine-tree pattern. The rash can cause itching, which is occasionally severe.

When to see a doctor

See your doctor if you develop a persistent rash.

Causes

The exact cause of pityriasis rosea is unclear. Some evidence indicates the rash may be triggered by a viral infection, particularly by certain strains of the herpes virus. But it's not related to the herpes virus that causes cold sores. Pityriasis rosea isn't believed to be contagious.

Complications

Complications of pityriasis rosea aren't likely. If they do occur, they may include:

Ø  Severe itching

Ø  On dark skin, lasting brown spots after the rash has healed

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