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Lymphomatoid papulosis in Child
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Lymphomatoid papulosis in Child

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Contributors: Amy Kalowitz Bieber MD, Belinda Tan MD, PhD, Whitney A. High MD, JD, MEng, Susan Burgin MD
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Synopsis

Lymphomatoid papulosis (LyP) is a recurrent, chronic, self-healing eruption that exists on a continuum with primary cutaneous anaplastic large cell lymphoma (C-ALCL). These 2 entities and their overlap cases make up the CD30-positive cutaneous lymphoproliferative disorders that represent about 25% of cutaneous T-cell lymphomas. Despite its malignant histopathologic qualities, LyP generally follows a benign clinical course. LyP and C-ALCL share many histopathologic features; morphology and disease course are important distinguishing factors.

LyP may occur at any age, although it is unusual in childhood. LyP is characterized by recurrent crops of pruritic, papulonecrotic, or nodular lesions that are self-healing over weeks or months. Lesions in various stages of healing are often seen. Lesions are often pruritic and may resolve with scarring. Six histopathologic subtypes are recognized by the 2018 WHO-EORTC classification and are described below. Specific subtypes of LyP do not correlate with clinical findings. Both the clinical history and histopathologic findings must be consistent with LyP for diagnosis; histopathology alone is not sufficient.

The cause of LyP is unknown, and its pathogenesis is only partially understood. Interactions between CD30 and its ligand appear to be important, and mutations in TGF-beta receptors may contribute. Identification of human T-cell lymphotropic virus type 1 (HTLV-1), herpesviruses 6, 7, and 8, and human endogenous retroviruses within LyP has been reported, but no clear relationship has been found. Several reports also suggest radiation therapy and fingolimod as triggers.

There is debate whether LyP is an inflammatory disorder or an indolent T-cell malignancy, but most authors categorize it as the latter. Most patients with LyP have chronic, self-limited eruptions. It is estimated that 10%-20% of patients with LyP will develop another lymphoproliferative disorder, such as ALCL, Hodgkin disease, or mycosis fungoides (MF). Patients with LyP should be monitored closely for these additional malignancies.

Codes

ICD10CM:
D23.9 – Other benign neoplasm of skin, unspecified

SNOMEDCT:
31047003 – Lymphomatoid papulosis

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Differential Diagnosis & Pitfalls

Best Tests

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Therapy

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Drug Reaction Data

Below is a list of drugs with literature evidence indicating an adverse association with this diagnosis. The list is continually updated through ongoing research and new medication approvals. Click on Citations to sort by number of citations or click on Medication to sort the medications alphabetically.

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References

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Last Reviewed: 10/17/2019
Last Updated: 11/22/2019
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Lymphomatoid papulosis in Child
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Lymphomatoid papulosis : Scattered many, Eschars, Firm papules
Clinical image of Lymphomatoid papulosis
Numerous erythematous papules and some nodules, one with a central crusted ulcer, on the arm.
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