Sudden growth of a black mole on the leg may be caused by nevus pigmentosus or seborrheic keratosis, which needs to be treated by laser, freezing and surgery according to the specific symptoms.
1. Nevus melanosus: it can be caused by hereditary factors and may also be related to environmental factors. If the location of nevus is not easy to be stimulated by friction, and the area is small, the shape is regular, the color is uniform, and there is no obvious discomfort or change (such as pain, ulceration), the possibility of malignant transformation is generally small. Generally, there is no need for special treatment, and it can be removed by laser or cryotherapy for aesthetic reasons.
If the nevus is located in the groin and other parts of the body that are susceptible to friction and stimulation, is large in size, irregular in shape, uneven in color distribution, or undergoes obvious changes (e.g., enlargement, bleeding, etc.), then it has a higher possibility of malignant transformation. This kind of nevus should be surgically removed in time to avoid malignant tumor and life-threatening.
2. Seborrheic keratosis: it is a kind of benign tumor, which can be manifested as spots or plaques with different sizes and clear boundaries, and the color is mostly brown or black, and it can be treated with cryotherapy, laser or surgery.
Suddenly grow a mole on the leg, there may be other reasons, it is recommended to timely to the regular hospital, clear cause, under the guidance of the doctor standardized treatment.