Moles on the neck may not necessarily become cancerous, and the details may vary from person to person, depending on factors such as changes in its shape, individual’s physical condition, and the effectiveness of timely treatment. 1. Cases with small possibility of cancer: moles with regular shape, uniform color, small area (usually <6mm in diameter) and no obvious changes, patients who are still young and undergo standardized and effective treatments in time (such as laser treatment, surgical excision, etc., and some of the moles do not need any special treatments) will not necessarily become cancerous. 2. When the possibility of cancerous transformation is higher: if the shape is asymmetric, the color distribution is uneven, the area is large (usually diameter >6mm), obvious changes occur (such as enlargement, ulceration, infection, satellite foci around, etc.), the patient is older, and the intervention is not timely or appropriate, the risk of cancerous transformation will be higher. To summarize, when a mole grows on the neck, one should pay attention to observing its morphological changes, and seek medical treatment in time if there is any discomfort, so as to avoid delaying the treatment time and causing adverse consequences. Do not make blind judgment and dispose of it by yourself.