A normal mole is an evenly-colored brown, tan, or black spot in the skin. It is either flat or raised, Its shape is round or oval, and it has sharply defined borders. A mole may be present at birth, or it may appear spontaneously, usually in the first few decades of life. Sometimes several moles appear at about the same time, especially on sun-exposed areas of the skin. Once a mole has fully developed, it normally remains the same size, shape, and color for many years.
Most moles eventually fade away in older persons.
Almost everyone has moles, on the average of about 25. The vast majority of moles are perfectly harmless. A sudden or continuous change in a mole s appearance is a sign that you should see your physician. However, a melanoma is more complicated than a mole. ABCD Rule of the Signs of Melanoma Asymmetry.