There are several reasons for more moles: 1. Congenital heredity: Most pigmented moles grow after 2 weeks of age, and some people, especially Caucasians and fair-skinned people, are more prone to moles. 2. Excessive sun exposure: Not paying attention to sun protection. Ultraviolet rays will interfere with melanocytes and aggravate the synthesis of pigmented moles. If you do not pay attention to sun protection, you may have more newborn moles in adulthood. 3. Radiation stimulation: It has been reported in the literature that pigmented moles will increase after receiving excessive radiation, and there may be a relationship between the two. 4. Laser: Stimulation of corrosive potions. Sometimes laser mole removal is easy to provoke mole cells instead, causing the increase of pigmented moles. You can combine your own situation and the above, and pay attention to analyze the reasons for more pigmented nevi.