If a pigmented nevus on the face is itchy, it does not mean that it is cancerous and does not need to worry too much, but it may also be caused by cancerous lesions and should be clearly distinguished. 1. Non-cancerous transformation: the boundary of the mole is clear, the activity is good, there is no continuous enlargement, and there is no obvious change in color. 2. Carcinoma: moles with enlarged scope, blurred boundary, redness, ulceration and bleeding, one of the very important manifestations, if scattered small nodules are found around the pigmented mole, this may suggest that the pigmented mole has a high possibility of malignant transformation. If the nevus is simply itchy, the possibility of malignant transformation is not high, so there is no need to worry too much. However, if itching or any of the above mentioned symptoms occur, you should go to the hospital and consult a doctor. If necessary, it may be necessary to remove the pigmented nevus and send it for pathologic examination to assist and guide the next treatment plan.