Depending upon the "spot" and your ethnic background, there are different options. First, choose a board certified dermatologist. He/she can determine if your brown spots are better treated with RX topicals, a device, or a combination. If your "spots" are actinic keratoses, then nitrogen freezing is typical. However, it's not always a good choice and especially so if you have ethnic skin which could respond with even darker spots. Fraxel is a laser used to treat actinic keratoses and sun induced spots, but again, may not be a best option depending on your genetic background. "White" skin is ideal for laser. Skin that tans easily is different story. Anything that causes inflammation (freezing or laser) can call up increased pigment. Pico second lasers can help fragment pigment so it's more easily sloughed off and does so at pulse speeds that reduce the heat buildup that causes inflammation.