Pityriasis rosea is an itchy rash that starts on the torso. Currently there is nothing specifically known to cause pityriasis rosea. One thought is that a virus such as a variety of the human herpes virus may be a cause.
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Honor Society of Nursing (STTI) answeredHelpful? 1 person found this helpful.
Dr. Mehmet Oz, MD, Cardiology (Cardiovascular Disease), answered
The cause of pityriasis rosea is not altogether clear. Some medical professionals believe that the human herpesvirus 6 and 7 may play a role in the condition.