Pityriasis Lichenoides

Question 1

Two forms of pityriasis lichenoides

Answer 1

1. Acute form: PLEVA (pityriasis lichenoides et varioliformis acuta)
2. Chronic: (PLC)

Question 2

Clinical course

Answer 2

Tends to persist longer in children than adults and acral involvement including the face is more common in children

Question 3

PLEVA presentation

Answer 3

polymorphous, asymptomatic to pruritic 2-3mm symmetric reddish-brown macules and papules. Papules occur in successive crops and rapidly evolve into vesicular, necrotic and sometimes purpuric lesion
- febrile ulceronecrotic form as well

Question 4

How does PLC arise

Answer 4

may begin de novo or evolve from PLEVA

Question 5

Pityriasis Lichenoides etiology

Answer 5

Associated with preceeding viral infection (HHV8 or parvovirus) or immunization (MMR)

Question 6

Pityriasis lichenoides tx

Answer 6

UV light is most effective, can consider 3mo trial of antibiotics wuch as erythromycin/azithromycin/tetracyclines