Final answer:
Nonmalignant factors such as esophageal metastases, bronchial cancer, Hodgkin disease, and sarcoidosis can cause skin thickening. However, skin thickening can also be caused by other nonmalignant factors such as increased production of connective tissue or an increase in Pacinian corpuscles around a wound. Lung cancer, specifically squamous cell carcinoma, affects the cells of the lungs and is the second most common type of skin cancer.
Step-by-step explanation:
Nonmalignant factors such as esophageal metastases, bronchial cancer, Hodgkin disease, and sarcoidosis can cause skin thickening, but it does not necessarily mean that skin thickening is always malignant. Skin thickening can also be caused by other nonmalignant factors such as increased production of connective tissue or an increase in Pacinian corpuscles around a wound.
Lung cancer, specifically squamous cell carcinoma, affects the cells of the lungs and is the second most common type of skin cancer. It can metastasize if not treated in time. Lung cancer is characterized by uncontrolled cell growth and can spread to other parts of the body.