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.
Types of Skin Lesions. Two types of skin lesions exist: primary and secondary. Primary skin lesions are abnormal skin conditions present at birth or acquired over oneâs lifetime. Birthmarks are primary skin lesions. Other types include:1  blisters: also called vesicles; these are small lesions filled with a clear fluid. 2  Vesicles can be the result of sunburns, steam burns, insect bites, friction from shoes or clothes, and viral infections. 3  macule: freckles and flat moles.ypes of Skin Lesions. Two types of skin lesions exist: primary and secondary. Primary skin lesions are abnormal skin conditions present at birth or acquired over oneâs lifetime. Birthmarks are primary skin lesions. Other types include: