The histologic sections showed a well-circumscribed nodular proliferation of histiocytes in the superficial and deep dermis. A grenz zone was present. The histiocytes were spindled at the periphery of the nodule. They had a moderate amount of eosinophilic cytoplasm and oval nuclei. Occasional cells were foamy, but they did not have the marked cytoplasmic vacuolation that is characteristic of lepra cells. The Fite stain demonstrated numerous intracytoplasmic, long, acid-fast bacilli.
Shiny Red-Brown Papules in a 21-Year-Old Man—Diagnosis. Arch Dermatol. 2004;140(6):751. doi:10.1001/archderm.140.6.751-g
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