Pityriasis rosea

Question 1

The aetiology is not fully understood but is thought that

Answer 1

herpes hominis virus 7 (HHV-7) may play a role.

Question 2

features of Pityriasis rosea

Answer 2

minority may give a history of a recent viral infection

herald patch (usually on trunk)

erythematous, oval, scaly patches which follow a characteristic distribution with the longitudinal diameters of the oval lesions running parallel to the line of Langer. This may produce a ‘fir-tree’ appearance

Question 3

Mx Pityriasis rosea

Answer 3

self-limiting - usually disappears after 6-12 weeks