Detailed answer

Dark spots on the skin, also known as hyperpigmentation, are generally not a direct sign of lung diseases. Lung diseases typically present with symptoms such as coughing, shortness of breath, and chest pain. However, in some cases, certain medications used to treat lung diseases may have side effects that include skin discoloration. It is essential to consult with a medical professional to properly diagnose and address any concerns related to lung health or skin discoloration.