Pityriasis lichenoides chronica, short form PLC, is the chronic version of the Pityriasis lichenoides et varioliformis acuta, also called Mucha Habermanns Disease. Pityriasis lichenoides encompasses a spectrum of clinical presentations ranging from acute papular lesions that rapidly evolve into pseudovesicles and central necrosis (pityriasis lichenoides et varioliformis acuta or PLEVA) to small, scaling, benign-appearing papules (pityriasis lichenoides chronica or PLC). The condition can range from a relatively mild chronic form to a more severe acute eruption. The mild chronic form is known as pityriasis lichenoides chronica. It is characterised by the gradual development of symptom less, small, scaling papules that spontaneously flatten and regress over a period of weeks. It is a disease of the immune system.
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Causes:
A number of acute exanthems (eg, Mucha-Habermann disease, pityriasis rosea, acute lichen planus, guttate psoriasis, erythema multiforme) are believed to be caused by a hypersensitivity reaction to infectious agents. Familial outbreaks, clustering of cases, and comorbid symptoms have been used to support these relationships in Mucha-Habermann disease, although clear causality is lacking.
Signs and Symptoms of Pityriasis lichenoides chronica
Pityriasis Lichenoides start out as a small rash that is red-brown in color that appears to be raised. Sometimes these bumps can have a clear fluid inside them. Unlike pityriasis lichenoides et varioliformis acuta, lesions are not painful, itchy or irritable. Pityriasis lichenoides chronica most commonly occurs over the buttocks, arms and legs, trunk. It almost feels like you are coming down with a case of the flu.
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Treatment of pityriasis lichenoides
Pityriasis lichenoides 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. Large ulcerations found in febrile ulceronecrotic Muchas-Habermann disease require local wound care.
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In cases where treatment is necessary, there are several different therapies available. Current recommended first-line therapies include:
* Sun exposure may help to resolve lesions but sunburn should be avoided.
* Topical steroids to reduce irritation. In more recent years concerns raised about their side effect profile has led to the increased use of nonsteroidal topical immunomodulators.
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Pityriasis Lichenoides Chronica Facts and Pityriasis Lichenoides Chronicatreatment