Pityriasis rosae Gibert

Question 1

Definition and age group

Answer 1

Acute, self-limited papulosquamous eruption that favors otherwise healthy adolescents and young adults
between the ages of 10 and 35 years

Question 2

Possible causes

Answer 2

viral etiology: human herpesvirus-7 (HHV-7) and, less so, on HHV-6

Question 3

Clinical Presentation

Answer 3

1) it begins with a single round or oval “herald” or “mother patch” that’s sharply delimited with raised margins, pink or salmon colored in light skin, while hyperpigmented in dark skin, and is usually located on the neck, chest, or back. size of patch is (1-10cm)
2) This patch soon becomes scaly and begins to clear centrally, which is often described as a “collarette” of scale.
3) over the course of a few days, the eruption spreads outward in a “Christmas tree distribution”/ fir tree or from the top down usually on the back

Question 4

Diagnosis and treatment

Answer 4

Diagnosed clinically
usually asymptomatic and self-limited (6-8W)
topical corticosteroids may be needed for symptomatic relief
Severe cases: UVB phototherapy, sunlight exposure and oral antihistamines.
Rarely systemic corticosteroids may be required

Question 5

Diiferential

Answer 5

Looks like syphilis but it spares the palms and soles

Tinea corporis: use KOH to exclude