This is a 2-month old female with a history of a hemangioma on her right buttock since 2 weeks of age. The lesion began as a small birthmark and has continued to grow, and is now ulcerated.

The rash is also a symptom of Castleman disease, a condition caused by a rare blood disorder and a human herpesvirus 8 (HHV-8) infection. Angiomas and hemangiomas both consist of blood vessels and are ...