Arvinder, a 24-year-old woman, presents with multiple erythematous annular lesions with collarette scales predominantly arranged over the trunk. The most likely diagnosis is (AIIMS Nov 2014)
|B||Pityriasis rubra pilaris|
|D||Pityriasis lichenoid chronica|
Pityriasis rosea – PR is a self-limiting condition common in adult manifest as sudden eruption of asymptomatic, oval, annular, circular, erythematous and scaly lesions.
1). The margins of the lesions are more prominent and pink with fine collarette-like scales.
2). Herald patch- single patch two or three days earlier than the main eruption causes are.
a. HHV 7 infection
b. Drugs : Arsenic metronidazole and Isotretinoin.
Pityriasis rubra pilaris (PRP) - Common in late middle age or elderly and is often of sudden onset, usually the disease begins on the face and scalp.
1). Is a follicular keratotic conditions characterized by tiny acuminate erythematic or skin coloured follicular papules
2). The individuals follicular papules are better felt with the back of one's hand and impart a feel like a nutmeg grater this is best demonstrated on the extension aspect of the proximal phalanges; involvement of this site is pathognomic of RRP.
3). Treatment - Emollients, oral vitamin A, therapy, oral retinoids, methotrexate.