Sudden growth of black moles on the neck may be pigmented nevus, melanoma and other diseases.
1. Nevus pigmentosus: the cause of this disease is not yet clear, it is caused by abnormal proliferation of melanocytes in the skin, and there is no obvious cause for nevus pigmentosus to appear suddenly on the neck.
2. Melanoma: if there is a pigmented nevus on the neck in the past, and the local area has been gouged for a long time or rubbed by necklaces and clothes, and if there is a sudden and unexplained rapid increase, irregular edge of the skin lesion, ulceration or pus, etc., it is considered that the pigmented nevus has a high probability of malignant transformation, and it may be suffered from melanoma.
It is recommended that patients with sudden growth of nevus on the neck should go to the hospital in time and receive standardized treatment after clear diagnosis by the doctor, so as to avoid delaying the condition.