Become familiar with your skin and your own pattern of moles, freckles and beauty marks. Make sure to look at your entire body every month or two. Watch for changes in the number, size, shape and color of pigmented areas. Warning signs to look for include changes in the surface of a mole; scaliness, oozing, bleeding or the appearance of a new bump; spread of a pigment from the border of a mole into the surrounding skin; change in sensation (i.e., itchiness, tenderness, pain). Consult a dermatologist promptly if any changes are observed.