Age spots on legs are usually related to skin aging, sun exposure and other factors, and can be removed by freezing, laser and other methods. The scientific name of age spots is seborrheic keratosis, which is a benign skin tumor, preferred by people above middle age, manifesting as a slowly increasing brown or black flat papule with rough surface or papillomatous hyperplasia, which is related to skin aging and long-term sun exposure. Seborrheic keratosis generally does not require treatment, and if you want to remove it, you can do so by using physical treatments such as lasers and freezing. If black or brown patches appear on the skin, you need to go to the dermatology department of a regular medical institution to clarify whether it is seborrheic keratosis, and if necessary, you need to be operated by a medical professional to remove it.