Clinical Features:

• Papulosquamous eruption of probable viral etiology primarily affecting children and young adults
• A viral prodrome is followed by single large lesion known as a "herald patch."  Later, a more generalized rash develops in a "Christmas tree" distribution on the trunk.

Histologic Features:

• Spongiosis
• The epidermis may be normal in thickness to mildly acanthotic.
• Focal parakeratosis, sometimes with one end of the parakeratotic focus "tilting up"
• Perivascular lymphocytic infiltrate with varying degrees of exocytosis
• Dyskeratosis and red blood cell extravasation may sometimes be present.

Cases associated with this book:

Spongiotic pityriasis rosea
Author: Stephen Lyle, M.D., Ph.D.

Conference: DermatopathologyConsultations.com Teaching Collection