Pityriasis rosea, a rash that usually appears on the torso, upper arms, thighs or neck, may sound worse than it really is. The unsightly condition has a name that’s hard to say: pit-ih-RIE-uh-sis ROW-zee-ah. But it’s common and fairly easy to treat.

Though the exact causes are still unknown, doctors think it’s related to a viral infection, particularly some forms of herpes. It generally affects children, teens, and adults in their 20s, though it can appear on people of any age. It also may affect you if you’re pregnant.

It’s not contagious and, in most people, does not leave marks or scars after it heals.