A hairy mole is not a melanoma, but it may turn into one. If a hairy nevus develops abnormal phenomena such as deepening of color, breakage, or oozing of blood, it is important to be vigilant about whether it is transformed into melanoma. Most hairy moles are benign pigmented nevi, which usually have no clinical symptoms, are painless and itchy, and do no harm to the body, so no treatment is needed. Melanoma is a tumor that results from the malignant transformation of melanocytes. The cause of the disease is unknown, and the risk factors for its development may be related to multiple moles or dysplastic moles. A hairy mole is not a melanoma, but if a hairy mole or other moles that are often rubbed together change in color, grow suddenly, itch, erode, or if a new pigmented mole suddenly appears in the surrounding area, it is necessary to be alert to the possibility of cancerous transformation into a melanoma. Once a hairy nevus shows abnormal symptoms, it is recommended to consult a doctor in time, perform tissue biopsy according to the doctor’s instruction, and do pathological examination to determine the nature of the nevus, and once it is malignant, it should be surgically excised immediately.