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Research ArticlePractice

Answer: Can you identify this condition?

Ossama Abbas and Salah Salman
Canadian Family Physician July 2009, 55 (7) 715;
Ossama Abbas
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Salah Salman
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Answer to Dermacase continued from page 711

2. Cutaneous lymphoid hyperplasia

First described in 1894, cutaneous lymphoid hyperplasia (CLH) is a benign, reactive, lymphocytic process that occurs most often in adults and less commonly in children.1,2 Cutaneous lymphoid hyperplasia represents an exaggerated local immunologic reaction to an often unrecognized trigger, such as vaccinations, arthropod bites, tattoos, medications, and Borrelia burgdorferi infection, the latter most commonly seen in Europe.1,2

Typically, CLH presents as a solitary, firm, slightly tender, erythematous to violaceous papule or nodule on the head, neck, or upper extremities, with no surface changes.1,2 Histology usually reveals a superficial and deep nodular or diffuse polymorphic infiltrate comprising lymphocytes, histiocytes, and occasional plasma cells and eosinophilic leukocytes.1,3,4 Lymphoid follicles with germinal centres surrounded by a mantle might be noted. Immunoperoxidase studies might be used to confirm the polymorphic nature of the infiltrate, including the presence of CD4-positive and CD8-positive T lymphocytes, CD20-positive B lymphocytes, and CD68-positive histiocytes. Clonality has been reported in CLH, but it currently remains unclear if this is related to the rare occasions when CLH progresses to lymphoma.2

Diagnosis of this case was made after biopsy confirmed clinical findings.

Differential diagnosis

Differential diagnosis of CLH includes pyogenic granuloma, epidermal inclusion cyst, and Spitz nevus. Pyogenic granuloma usually presents as a solitary, rapidly growing, red, vascular lesion on the face or fingers. Differentiation from CLH is clinically possible, based on the lesion’s soft consistency, rapid growth, and recurrent bleeding.5 An epidermal inclusion cyst is a benign, cutaneous cyst that commonly presents as a skin-coloured or red inflamed papule or nodule on the face or trunk. Differentiation from CLH is based on its soft consistency.6 Spitz nevus is a melanocytic nevus that usually presents as an asymptomatic, small (less than 1 cm), pink to red papule on the faces or extremities of children and adolescents.7 Clinical differentiation might be difficult, although the small size and smooth surface of Spitz nevus can be helpful. If in doubt, Spitz nevus as well as pyogenic granuloma and epidermal inclusion cyst can be differentiated easily from CLH histologically.1,2 Another important (and histologic) differential diagnosis of CLH is lymphoma cutis.1,2 Differentiation is important because lymphoma cutis is a manifestation of lymphoma whereas CLH is not. Histologic features that are helpful in differentiating CLH from lymphoma cutis include the presence of reactive germinal centres and the polymorphic nature of the infiltrate, including the mixed population of B and T lymphocytes.

Management

Although uncommon in the pediatric age group, family practitioners and dermatologists should always keep CLH in mind when evaluating a firm, solitary, red bump in a child. Early on and even when a diagnosis of CLH is suspected on clinical grounds, a conservative approach should be entertained, as most cases spontaneously resolve within a few weeks to months. If the lesion persists, then a punch biopsy is indicated to confirm the diagnosis and to rule out other conditions; it might also be curative. If a histologic diagnosis of CLH is confirmed, persistent cases with localized lesions might benefit from corticosteroids (topical or intralesional), cryosurgery, or simple excision. If these treatments are not effective, then radiation therapy is also an option.1

In this case, no treatment was necessary as the lesion resolved spontaneously 2 weeks after biopsy.

Footnotes

  • Competing interests

    None declared

  • Copyright© the College of Family Physicians of Canada

References

  1. ↵
    GilliamACWoodGSCutaneous lymphoid hyperplasiasSemin Cutan Med Surg200019213341
    OpenUrlPubMed
  2. ↵
    NihalMMikkolaDHorvathNGilliamACStevensSRSpiroTPCutaneous lymphoid hyperplasia: a lymphoproliferative continuum with lymphomatous potentialHum Pathol200334661722
    OpenUrlCrossRefPubMed
  3. ↵
    BaldassanoMFBaileyEMFerryJAHarrisNLDuncanLMCutaneous lymphoid hyperplasia and cutaneous marginal zone lymphoma: comparison of morphologic and immunophenotypic featuresAm J Surg Pathol19992318896
    OpenUrlCrossRefPubMed
  4. ↵
    AraiEShimizuMHiroseTA review of 55 cases of cutaneous lymphoid hyperplasia: reassessment of the histopathologic findings leading to reclassification of 4 lesions as cutaneous marginal zone lymphoma and 19 as pseudolymphomatous folliculitisHum Pathol200536550511
    OpenUrlCrossRefPubMed
  5. ↵
    GarzonMCEnjolrasOFriedenIJVascular tumors and vascular malformations: evidence for an associationJ Am Acad Dermatol2000422 Pt 12759
    OpenUrlCrossRefPubMed
  6. ↵
    TairaNAogiKOhsumiSTakashimaSKawamuraSNishimuraREpidermal inclusion cyst of the breastBreast Cancer20071444347
    OpenUrlCrossRefPubMed
  7. ↵
    SulitDJGuardianoRAKrivdaSClassic and atypical Spitz nevi: review of the literatureCutis20077921416
    OpenUrlPubMed
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Canadian Family Physician: 55 (7)
Canadian Family Physician
Vol. 55, Issue 7
1 Jul 2009
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