Pityriasis rosea (PR) is an acute, self-limiting exanthematous skin disease that clinically presents with a single lesion, known as “herald patch,” which is followed by the onset of numerous smaller lesions. Lesions consist of a well-demarcated, oval or round, salmon-colored, erythematous, or hyperpigmented patch presenting a fine peripheral scaling collarette. At dermatoscopy, both the herald patch and the secondary lesions of PR typically show a characteristic peripheral whitish scaling localized just inside the border (“collarette” sign) as well as dotted vessels, which, differently from psoriasis, are distributed in an irregular or focal pattern; diffuse or localized yellowish-orange structureless areas may be visible as well.
Pityriasis Rosea
Errichetti E.;Stinco G.
2026-01-01
Abstract
Pityriasis rosea (PR) is an acute, self-limiting exanthematous skin disease that clinically presents with a single lesion, known as “herald patch,” which is followed by the onset of numerous smaller lesions. Lesions consist of a well-demarcated, oval or round, salmon-colored, erythematous, or hyperpigmented patch presenting a fine peripheral scaling collarette. At dermatoscopy, both the herald patch and the secondary lesions of PR typically show a characteristic peripheral whitish scaling localized just inside the border (“collarette” sign) as well as dotted vessels, which, differently from psoriasis, are distributed in an irregular or focal pattern; diffuse or localized yellowish-orange structureless areas may be visible as well.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
