RGD uses the Human Disease Ontology (DO, https://disease-ontology.org/) for disease curation across species. RGD automatically downloads each new release of the ontology on a monthly basis. Some additional terms which are required for RGD's curation purposes but are not currently covered in the official version of DO have been added. As corresponding terms are added to DO, these custom terms are retired and the DO terms substituted in existing annotations and subsequently used for curation.
A hypersensitivity vasculitis that results_in inflammation of small blood vessels, characterized clinically by palpable purpura, which is a slightly elevated purpuric rash over one or more areas of the skin. (DO)