Pityriasis rosea is a: (AIIMS May 2014)
|B||Chronic relapsing disease|
|C||Auto immune disease|
|D||Caused by dermatophyte|
Pityriasis rosea is a disease of unknown etiology more commonly seen in spring and consists of papulosquamous eruptions. The disease is self-limiting and usually lasts for 3 to 8 weeks.
1). Young age (10-43 years) more commonly affected.
3). Etiology - Unknown, HHV 7- may have a role
4). Clinical features
The first manifestation is development of 2-6 cm annular lesion k.a. HERALD PATCH with fine COLLARETTE scales at periphery. Lesion are usually asymptomatic, may be pruritic. Lesions are usually confined to trunk and proximal aspects of arms and legs with characteristic distribution with the long axis of the oval lesion following the line of cleavage in a "CHRISTMAS TREE" PATTERN.
Oral anti histaminic or topical anti pruritic agent for symptomatic relief. UVB phototherapy or natural sunlight exposure may give relief if started in first week of eruption.