Pityriasis rosea (PR ... A solitary pink scaling annular patch is the distinguishing hallmark of PR (see Figure 1). This herald patch is first noticeable as a small erythematous papule, but ...

Classically, pityriasis rosea begins as an erythematous, scaly patch on the trunk, known as a herald patch. This large lesion is commonly 2–10 cm in diameter, ovoid, erythematous and slightly ...

This first lesion is called the herald patch, Oberoi says. The herald patch appears in up to 90% of pityriasis rosea cases and typically has a round or oval shape. Here's how the rash will ...