Moles, also known as pigmented moles, or nevus cell nevus, can occur on various parts of the body, including the back of the neck. However, because the neck area, which is the part of the collar or wearing jewelry such as necklaces, is prone to friction, moles in this area should be treated with special attention. Especially for some large pigmented moles, it is recommended to use the surgical removal method, which is the safest and can be completely removed. For some small pigmented moles, such as 2-3 mm, you can consider using methods such as carbon dioxide laser, or high frequency ionization to cauterize or vaporize these lesions, which can also be removed. However, after treatment, it is important to stay out of water to avoid infection.