A Answers (2)
Mehmet Oz, MD, Cardiology, answeredAs far as doctors know, pityriasis rosea is not contagious. That means you can't catch this disorder, which causes a skin rash that is often quite itchy. Pityriasis rosea often starts out as a small rash, but it can spread within days. A rash caused by pityriasis rosea sometimes takes the shape of a Christmas tree on a person's back. Tell your doctor if you have an unexplained skin rash.
Michael Roizen, MD, Internal Medicine, answered
We know pityriasis rosea is not caused by a bacteria or fungus so it isn’t contagious from those if you touch it. However, experts have a hunch that it is caused by a virus (maybe a herpes virus), so it is possible that you may be able to get the virus from someone who has it and then get the rash. The rash itself does not appear to be contagious by touch but seems to be a reaction to an internal virus (Best guess).