"No eyebrows. No eyelashes. When it rains the water will run straight down into my eyes," Catherine Lord wrote before her hair fell out during chemotherapy. Propelled into an involuntary performance piece occasioned by the diagnosis of breast cancer, Lord adopted the online persona of Her Baldness-an irascible, witty, polemical presence who speaks candidly about shame and fear to her listserv audience. While Lord suffers from unwanted isolation...