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.
If you have a lesion on your skin that you are concerned about, please go see a dermatologist! You dermatologist can reassure you if this is nothing to worry about, or perform a skin biopsy to determine exactly what is going on on your skin. Skin cancers can develop as a non-healing sore or bump on the skin that persists. Melanoma skin cancers often appear as pigmented lesions that can be asymmetric, have irregular borders, multiple colors or that are larger in size (larger than a pencil eraser).