According to Baidu health data, sudden nevus growth may be a benign change or malignant transformation of melanocytes:
1. Benign change: It may be caused by the activation of the original nevus cells, and generally no treatment is needed. The friction part can be surgically removed, and the aesthetic effect can be treated by laser or freezing.
2. Signs of malignant transformation: skin lesions appear in a short period of time, with uneven color, irregular edges, outward diffusion, easy bleeding and scabbing, and swollen lymph nodes nearby. Go to the hospital as soon as possible, pay attention to local cleanliness and have a light diet.