Muscle induration is a clinical manifestation of polymyositis. The etiology of polymyositis is unclear. The main clinical manifestations are symmetrical weakness of the proximal extremities, cervical muscles, and pharyngeal muscles. What tests and treatment should be done for patients with muscle induration? The following is a detailed description. Patients with muscle induration need to have serum myoglobin, urine creatine, urine glutamic oxalacetic transaminase (GOT), serum immunoglobulin G (IgG), and electromyography. It is also necessary to observe the body joint areas for redness, swelling, bulging, angry veins, sinus tracts, epileptic marks, muscle atrophy, and deformities. The peripheral blood leukocyte count is increased in the acute phase and normal in the stable phase. Serum CK and LDH are significantly increased during active disease. Electromyography suggests a combination of myogenic and neurogenic lesions, as seen by increased spontaneous fibrillation potentials and positive phase spike waves. Muscle biopsy may reveal pathological changes such as myofiber degeneration, necrosis, muscle atrophy and regeneration, interstitial inflammatory cell infiltration, small vessel obstruction, and capillary endothelial proliferation. Hemoglobin may be reduced, and proteinuria suggests renal injury. Blood sedimentation may be increased, serum globulin may be increased, and rheumatoid factor may be positive in low titers. Combined with the characteristics of muscle pressure pain, in order to relieve and treat muscle pressure pain, massage techniques can be used to relieve muscle pressure pain, improve local circulation of blood and Qi, external traction can be used to support the affected area to bring about restriction or stop the disease-causing action, reduce the tension of the strained muscle so that it can fully rest and restore normal function, and promote blood circulation through hot compresses can achieve better results.