Book excerpt: Although dermatomyositis is a rare connective tissue disease, many physicians are confronted with the diagnosis and treatment of patients affected by this condition. Based on the vast personal experience of the authors, who have diagnosed, treated, and managed many dermatomyositis patients, this clinical guide provides dermatologists, rheumatologists, pediatricians, neurologists, and general practitioners with the keys to interpreting the clinical symptoms of dermatomyositis. Also included are algorithms to help the reader to make the correct diagnosis, as well as guidance on new diagnostic methods and treatment schemes.