Eighty-year-old people have a lot of small black spots on their feet, and the causes include age spots, pigmented nevi and freckle-like nevi. 1. Age spots: the most common benign epidermal proliferative tumor in the elderly, the tumor cells originate from keratinocytes, which may be related to sun exposure and chronic inflammatory stimulation. 2. Pigmented nevus: a benign skin tumor of melanocyte origin. It can be manifested as raised small black spots. 3. Freckle-like nevus: brown or black spots on the skin or mucous membrane, rice grain to pea size, diameter length ≤5 mm, clear boundary, smooth surface or slight flaking. Related to sun exposure or genetic factors. The phenomenon of the eighty-year-old man’s feet growing a lot of small black spots, please consult a doctor in a timely manner, in accordance with the doctor’s instructions reasonable treatment.