Pityriasis Rosea

Definition: rosea is a with bumps and scaling that affects children and young ​ adults.

Signs: ● There may be mild signs such as , , , sore throat, decreased appetite or aches prior to the in a minority of cases ● Peak age for Pityriasis rosea is in adolescence but it occurs in all ages in childhood ● 60-90% of people with Pityriasis rosea will have a “herald patch”, a smooth pink oval-shaped spot ranging from1/2 inch to 5 inches in diameter, usually found on the trunk or occasionally on the upper arm or thigh. This is sometimes mistaken as ringworm until the rest of the rash erupts. ● A symmetrical rash develops up to 21 days after the herald patch. Spots are ¼-1/2 inch pinkish to brown with a delicate scale along the edge. The spots may line up in a “Christmas tree” pattern on the torso. The face and scalp are usually not affected. Occasionally, there is a reverse pattern with spots mostly on the head and extremities. ● is mild to moderate and decreases after the first week ● Spots resolve in 2-12 weeks

Cause ● Pityriasis rosea is not caused by bacteria or fungus ● A has been proposed but not proven to cause Pityriasis rosea. o Clusters of cases occur in communities o No definite contagious cause is identified

Testing ● Diagnosis is based upon the appearance of the rash. ● No testing is necessary

Treatment ● Resolves on its own, usually within 12 weeks. Rarely persist more than 5 months. ● Itch is treated with cortisone cream or oral such as benadryl, Claritin or Zyrtec. ● (for its anti-inflammatory effect, not to kill bacteria) or UVB light therapy may be attempted in severe cases. ● Exposure to the sun is helpful

Reviewed 3/11, 11/13, 11/15

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