Note: Pityriasis rosea is commonly called "Christmas tree rash" because of its characteristic tree-like pattern: one large oval patch that branches out into smaller pink or dark patches.

Pityriasis rosea (PR) is an acute inflammatory skin ... to the lines of cleavage on the trunk in a characteristic Christmas tree-like pattern. Body surfaces with significant sun exposure are ...

The spots often look like a Christmas tree in shape. Pityriasis rosea may last several months before clearing. Purpuric or vasculitic rashes appear as deep purple or red spots and may cause bruise ...