Bacillary Angiomatosis

A vascular proliferative infection caused mainly by Bartonella species, seen particularly in people with significant immune suppression.
Red-purple papules, nodules or deeper lesions can resemble vascular tumors, and systemic organs may also be involved.
Diagnosis is supported by biopsy with characteristic histology, special stains, molecular testing or other microbiologic evidence.
Prolonged antibiotic therapy, commonly with a macrolide or doxycycline, is selected according to disease extent and immune status.
Recognition matters because the condition is treatable but may become disseminated when underlying immunodeficiency is severe.