A few years ago, due to a movie , there was a sharp increase in the number of patients consulting about pigmented moles, and many people were worried whether their moles would become malignant. Here we will tell you which moles need to be removed and which moles can be removed by laser freezing for aesthetic purposes? The following is a list of moles that need to be removed, which moles can be removed by laser freezing for aesthetic purposes, and the precautions to be taken for laser and cryotherapy. Nevus cell nevus, also known as nevus pigmentosus, is the most common benign skin tumor in humans. Nevus cells usually go through different stages of development, maturation and aging, and gradually move from the epidermis to the dermis with age. Mole cell nevi can be classified as congenital or acquired and can be present at birth, but often begin to appear after the age of two. It can occur anywhere on the skin and mucous membranes of the body. The lesions are flat or slightly elevated, with a smooth surface and may or may not have hair, and may be single, several to dozens in number. Depending on the type and content of pigment in the nevus cells, the lesions can be brown, brown, blue-black or black, and non-pigmented lesions are mostly skin-colored. The disease progresses slowly and most of them have no conscious symptoms. Here is a look at which moles need surgical removal? Pigmented nevi generally do not require treatment. If congenital nevus cell nevus has the possibility of melanoma, it should be surgically removed; junctional nevus and mixed nevus that occur in the palmoplantar, periaqueductal, axillary, groin and other friction-prone areas should also be considered for surgical removal. The following signs of malignant transformation should also be removed: 1) sudden increase in size; 2) darkening; 3) surface erosion, ulceration, bleeding or swelling; 4) self-induced pain or itching; 5) satellite lesions around the nevus. If the pigmented nevus is affecting the aesthetics and there is no indication for surgery as mentioned above, it can be removed by laser or cryotherapy: Laser surgery: High power laser such as carbon dioxide laser is used to destroy the tissue. After laser treatment, there will be different degrees of tissue fluid exuding from the local skin, which will generally scab after a few hours and peel off in about 1 to 2 weeks depending on the body type. The skin color will return to skin tone in 3-6 months. A few people will be left with varying degrees of superficial scars, and timely topical application of fibroblast growth factor after treatment can prevent scarring. After treatment, you need to pay attention to sun protection, keep the trauma surface dry for 3 days, and do not eat spicy and stimulating food during the recovery period. Cryotherapy: Using refrigerant to produce low temperature to necrosis the lesion tissue to achieve the purpose of treatment, intracellular ice crystal formation, cell dehydration, lipoprotein complex denaturation and local blood circulation disorders are the effect mechanism of freezing. The freezing agent is mainly liquid nitrogen. After freezing, local tissue whitening and swelling can be seen, blistering can occur within 1 to 2 days, and then drying and crusting can occur, and the crust will be removed in about 1 to 2 weeks. It is worth noting that, in order to avoid leaving scars, laser and cryotherapy do not guarantee to remove lesions at once, and often require multiple treatments. Patients are advised to follow up several times according to doctors’ recommendations, and for some deeper moles or moles of larger scope several treatments are needed to remove them completely.