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Image Number 184 (Pityriasis lichenoides)

 
Morphology:
Red,scaly

Diagnosis: Pityriasis lichenoides

Site: Wrist

Sex: M

Age: 34

Type: Clinical

Description: Characteristic scaly macules and papules at the wrist

Submitted by: Ian McColl

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Differential Diagnosis

History:

Pityriasis lichenoides comes in an acute and chronic form.It probably is a reaction to a viral infection in the skin but it takes a considerable time to settle.Clinically it resembles guttate psoriasis or secondary syphilis but it may show the characteristic mica or stuck on scale.Ultraviolet light is the most effective treatment to speed up resolution of the condition.

There is an acute form called PLEVA which is more papular and sometimes shows crusting and necrosis of the lesions.It is more likely to scar.



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