herald patch of pityriasis rosea
Histologic Features
- A parakeratotic horn with neutrophils and plasma
- Moderate psoriasiform epidermal hyperplasia
- Focal spongiosis in early stages
- Edema of the papillary dermis with extravasated red blood cells
- A superficial and deep perivascular lymphohistiocytic infiltrate
Updated Wednesday, July 31, 2013 8:30:48 PM