Derm Dx: Hair loss and absent follicles

A 44-year-old woman presents for evaluation of hair loss, which has progressively worsened over the past several years. She denies itching, pain, or antecedent redness or irritation, and family history is negative for baldness. She has no history of systemic disease and takes no medications or herbal supplements. She also denies the use of straighteners or application of prolonged traction ...