Pay attention whether the borders appear. We mean the aggressive swelling regions surrounded by borders are not normal, jagged, and tattered. Tumors which are not affected by melanoma are smooth. Their borders are regular. Mind any fluctuations in the skin of the mole. The most alarming signs include bleeding, scaliness, and formation of rash and spots. It is easy to identify these deviations visually. These changes are accompanied by the swelling feeling and red color. Another sign is a blurred, foggy mole.