How is pityriasis rosea caused?

k that it may be caused by a virus.

Pityriasis rosea (a mild exanthematous inflammation of unknown etiology)

In my own case the rash persisted for about 4 months until I saw the doctor. I was prescribed Terbinafine.

To relieve the itching, the doctor may prescribe calamine lotion, zinc oxide ointment, oral antihistamine medications, or topical ointments containing corticosteroids

I am recovering from case myself. Though I have yet to hear of anyone whose spots were painful, this was my chief complaint. Itching absolutely took a back seat to pain in my case. I applied an...