Arm spots may be caused by freckles, and age spots, moles and other factors cannot be ruled out. Patients can be relieved by drug intervention and physical therapy. 1. Freckles: should try to avoid or reduce the exposure to the hot sun, or apply sunscreen type of light-avoiding agent to reduce the occurrence of freckles or reduce the deepening of freckle color, can choose 3% to 5% hydroquinone cream, 0.1% retinol ointment and other topical application. 1. Age spots: patients need to remove the causative factors and do a good job of sunscreen to avoid long-term ultraviolet irradiation, which can aggravate the symptoms of arm spots. You can use tranexamic acid, azelaic acid, vinpocetine cream, etc., so as to play the role of chemical exfoliation, promote the renewal of epidermal cells, and improve the symptoms of arm spots. 2. Nevus: For the case of arm spots, it is not excluded that it is caused by nevus, patients can use laser treatment and other physical treatment methods, through selective photothermal effect, damage the melanin under the skin, and then achieve the effect of removing arm spots. Arm spots can have other reasons (such as lichen planus, etc.), according to their own situation with the doctor to choose the appropriate method of treatment, do not self-medication.