10 Pityriasis Rosea Facts
Fact #4: May Start with a Primary Plaque
Pityriasis rosea usually begins with a “herald patch” or primary plaque. This is a single red and slightly scaly region that is about 2 to 10 centimeters and most commonly seen on the abdomen. It may also be in an area that is unnoticeable such as the armpit. It can also appear as a cluster of small oval spots, which can easily be mistaken as acne.
The rash will subsequently spread 1 to 2 weeks after the herald patch appears. The herald patch is usually seen on the skin in 50 to 90 percent of cases.
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