Solar lentigines on the forehead
Solar lentigines (len-TIJ-ih-neze) are flat spots of increased pigmentation. They're usually brown, black or gray and vary in size. And they usually appear on areas most exposed to the sun, such as the face, hands, arms and upper back. These spots, also referred to as age spots or liver spots, are common in older adults. They also occur in younger people who spend a lot of time in the sun without protecting their skin.
Solar lentigines on the back
Solar lentigines tend to become more numerous with repeated sun exposure and with advancing age. Sometimes they develop in large numbers, as seen on this man's upper back. They're similar to freckles, though freckles tend to be smaller and develop earlier in life.