A normal person can also develop a few old lesions in both lungs. A few old lesions in both lungs means that there are some old lesions in both lungs. These old lesions are left behind after the original lung disease has been treated and healed, or after the immune system has healed, so normal people can also have a few old lesions in both lungs. These old lesions do not affect the body in any way and do not produce clinical symptoms, so they do not need to be treated. The small number of old lesions, including fibrous streaks or calcifications, are benign.