Pityriasis rosea is a harmless skin rash without a clear cause ... The first sign of pityriasis rosea is usually a round or oval scaly lesion with a raised border, known as a herald patch.

Skin-colored lesions are those that match ... Serpiginous lesions have a wavy or gyrate peripheral border. Annular lesions are round or serpiginous (i.e., with an arciform wavy border) and have ...