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October 1971

Cactus Granulomas of the SkinAn Allergic Phenomenon

Author Affiliations

Tucson, Ariz

From the Section of Dermatology, Department of Internal Medicine, College of Medicine, University of Arizona, Tucson.

Arch Dermatol. 1971;104(4):374-379. doi:10.1001/archderm.1971.04000220032006

Cactus-spine granulomas occurred in nine patients. Retained dermal barbs after skin puncture from the cholla and prickly pear varieties of Opuntia can cause this reaction on rare occasions. Results of skin tests with glochid extracts from these cacti support the hypotheses of an allergic granuloma.