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December 1983

Primary Granulomatous Dermatitis Caused by RhodochrousEvidence for a Pathogenic Role in Humans

Author Affiliations

From the Department of Dermatology, James E. Holmes Regional Medical Center, Melbourne, Fla (Dr Chanda); and the Departments of Dermatology and Pathology, University of Michigan Medical Center, Ann Arbor (Dr Headington).

Arch Dermatol. 1983;119(12):994-997. doi:10.1001/archderm.1983.01650360040010

• Bacteria belonging to the Rhodochrous complex are of uncertain taxonomic status. Currently excluded from the genus Mycobacterium, these organisms are more closely allied to Nocardia. Organisms of the Rhodochrous complex have only rarely been implicated as human pathogens. An 81-year-old man had a plaquelike cutaneous granuloma from which Rhodochrous was both cultured and demonstrated in tissue section. A pathogenic role for Rhodochrous causing a primary cutaneous infection is suggested. Specific antimicrobial treatment with doxycycline hydrochloride was successful and there has been no recurrence of the infection after three years.

(Arch Dermatol 1983;119:994-997)