Pityriasis Rosea

Question 1

PR

Answer 1

scaly, pink, self limited eruption affecting young adults

Question 2

Epidemiology

Answer 2

peak incidence is young adults, slight increase in females, eruption lasts 8 weeks but can persist for 6 months, peaks in spring and the fall

Question 3

Etiology

Answer 3

herpes virus 7 most often postulated as the etiology

Question 4

Clinical features

Answer 4

pink, scaly, oval appearing lesions with a collarette of a scale, “Christmas tree pattern”.

Question 5

initial sign

Answer 5

herald patch 1-10cm in size precedes rash by 1-2 days, 50% of cases this occurs

Question 6

inverse type

Answer 6

affecting axilla and inguinal areas

Question 7

ddx

Answer 7

secondary syphillis - will have lymphadenopathy, primary chancre… drug eruptions, tinea corporis, guttate psoriasis will have smaller lesions over entire body, PLEVA if lasts more than 6 mo

Question 8

tx

Answer 8

asymptomatic no treatment, patient reassurance, pruritus tx with antihistamines and topical steroids