Pityriasis Lichenoides

A clinical and histopathological study of pityriasis lichenoides.

BACKGROUND Pityriasis lichenoides is a papulosquamous disorder of unknown etiology with remissions and exacerbations. Histopathology helps greatly in the diagnosis of this condition. AIM We studied clinical and histopathological features of pityriasis lichenoides in our patients. METHODS This is a 3-year retrospective and prospective, descriptive study of all patients clinically diagnosed a...

Differentiation and clonality of lesional lymphocytes in pityriasis lichenoides chronica.

BACKGROUND Pityriasis lichenoides chronica (PLC) and pityriasis lichenoides et varioliformis acuta (PLEVA) are benign T-cell diseases that share several overlapping clinicopathologic features, leading many to believe that they exist as a spectrum rather than as single entities. Previous molecular studies have shown that PLEVA is a clonal lymphoproliferative disorder. To further characterize the...

Pityriasis Lichenoides Et Varioliformis Acuta (Mucha-Habermann Disease)

Pityriasis lichenoides et varioliformis acuta after influenza vaccine*

The etiology of pityriasis lichenoides is unknown. One of the accepted theories admits that PL is an inflammatory response to extrinsic antigens such as infectious agents, drugs and vaccines. In recent medical literature, only the MMR vaccine (Measles, Mumps and Rubella) was associated with the occurrence of this disease. We present a case of a male, 12 year old healthy patient who, five days a...

Pityriasis lichenoides chronica with acral distribution mimicking palmoplantar syphilid.

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