Final answer:
Age spots, also known as liver spots or solar lentigines, are small brown macules that appear on the face and arms due to long-term sun exposure.
Step-by-step explanation:
The term for small brown macules, especially on the face and arms, brought on by sun exposure, usually in a middle-aged or older person, is age spots. Age spots are also known as liver spots or solar lentigines. They are caused by an accumulation of melanin in the skin due to long-term sun exposure.