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Immunophenotypic analysis suggests that granuloma faciale is a gamma-interferon-mediated process.

Granuloma faciale (GF) is an uncommon inflammatory dermatosis with characteristic clinical and histologic features. Very little is known about its pathogenesis. We used a battery of immunoperoxidase lymphocyte markers to study the population of hematopoietic cells present in a case of GF. The majority of non-myelocytic hematopoietic cells present were T-helper lymphocytes. The cells stained strongly with antibodies against the interleukin-2 receptor and with anti-lymphocyte functional antigen (LFA 1 alpha) antibodies. Overlying keratinocytes did not stain with ICAM-1 or HLA-DR, which may account for the presence of the Grenz zone in granuloma faciale. These findings suggest that a gamma-interferon-mediated process may play some role in the pathogenesis of this disorder.

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