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Bacillary angiomatosis (BA) is a form of angiomatosis associated with bacteria of the genus Bartonella.

Cutaneous BA is characterised by the presence of lesions on or under the skin. Appearing in numbers from one to hundreds, these lesions may take several forms:

papules or nodules which are red, globular and non-blanching, with a vascular appearance

purplish nodules sufficiently similar to Kaposi's sarcoma that a biopsy may be required to verify which of the two it is

a purplish lichenoid plaque ...