Pityriasis rosea

Question 1

What virus causes Pityriasis rosea?

Answer 1

HHV6 or HHV7

Human herpesviruses 6 and 7 are known to be associated with Pityriasis rosea.

Question 2

Prognosis of Pityriasis rosea?

Answer 2

self-limiting

Pityriasis rosea typically resolves on its own without treatment.

Question 3

What is the first sign of Pityriasis rosea?

Answer 3

Herald patch

The Herald patch is a larger pink ellipse that appears first.

Question 4

Where does the Herald patch usually appear?

Answer 4

On the back or trunk

The Herald patch is commonly found on the back or trunk of the body.

Question 5

What is the typical pattern of spread for Pityriasis rosea?

Answer 5

Christmas tree distribution

The rash spreads upward onto the shoulder blades from the back or truck, resembling a Christmas tree.

Question 6

In which age group is Pityriasis rosea more common?

Answer 6

In the 20s

While it can occur in teenagers, it is more frequently observed in individuals in their 20s.

Question 7

Answer 7

Pityriasis rosea - Starts as Herald patch (larger pink ellipse above), usually on the back or trunk, then spreads upward onto the shoulder blades (“Christmas tree distribution”); USMLE will
show you image and expect you can make spot-diagnosis.