The Department of Defense is headed by a civilian; the Secretary of Defense, who is appointed by the President of the United States. Under the Secretary of Defense, there are three military departments: The Department of the Army, the Department of the Air Force, and the Department of the Navy. 1  Each of these military departments are also headed up by civilians; the Secretary of the Army, the Secretary of the Air Force, and the Secretary of the Navy.
Melanoma is not as common as other types of skin cancer, but it's the most serious and potentially deadly. Possible signs of melanoma include a change in the appearance of a mole or pigmented area.
Skin cancer and precancerous changes in the skin are more serious causes of skin lesions. These lesions most commonly appear on areas of your body that have been exposed to sun, including your face, arms and hands. skin lesion is any change in the normal character of your skin. A skin lesion may occur on any part of your body and cover a tiny or large area.