Fading moles can be categorized into physiological and pathological reasons. 1. Physiological phenomenon: If there is no change in the size, shape and surrounding skin of the mole, it is usually due to aging or time lapse and other reasons that cause local melanocyte senescence, which leads to the lightening of the color of the mole. In addition, the decrease of immunity or the change of hormone level in the body, local friction and other reasons can cause the mole to become lighter in color. 2. Pathological reasons: If the mole becomes lighter and accompanied by fever, bleeding, erosion, redness, swelling and pain, it may be caused by cancerous transformation of the mole, and it is recommended to treat the mole in time through surgery and other means. If the above situation occurs, it is recommended to go to the hospital for consultation to clarify the cause of the disease and treat the symptoms to avoid aggravation of the condition.