How is your daughter? The acute form of pityriasis lichenoides is characterised by the abrupt eruption of small scaling papules that develop into blisters and crusted red-brown spots. This is also known as pityriasis lichenoides et varioliformis acuta (PLEVA). The cause of pityriasis lichenoides is not yet known but 3 major theories exist: an inflammatory reaction triggered by infectious agents; a relatively benign form of T-cell lymphoproliferative disorder; or an immune-complex-mediated hypersensitivity vasculitis.
This condition may not always respond to treatment and relapses often occur when treatment is discontinued. If the rash is not causing symptoms, treatment may not be necessary. You can read more about this through this link: http://dermnetnz.org/scaly/pityriasis-lichenoides.html
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