In a quaint restaurant in Rome, Lynett Marie—a Detroit, Michigan native—did a simple yet profound act she hadn’t done in years: She danced. Her long-awaited trip to Italy with her best friend to attend Easter Mass at the Vatican almost didn’t happen. Just months prior, Lynett Marie was bound to a wheelchair and walker due to a debilitating disease that few Americans know much about: lupus. Lynett Marie has one of the most common forms of lupus, known as systemic lupus erythematosus (SLE), which impacts the lives of up to 300,000 Americans—and counting. SLE is a complex, chronic disease attacking the body’s immune system. Its unpredictable nature means it manifests in everyone differently, but some of the most common symptoms include fatigue, skin rashes, fevers, and pain or swelling in the joints. But when Lynett Marie, a self-described “lupus warrior,” finally found the right treatment plan for her SLE, from that point on, she says, “Things just kept getting better, and better, and...