Is there anything that can be done to lighten moles?

Yes...but... Moles (nevi) are proliferation of pigment producing cells. In some cases, a mole can transform into malignant melanoma. We monitor this transformation thru changes in its pigmentation. Moles can indeed be lightened with lasers. However, in doing so, we will have removed the very indicator that we use to monitor them. For that reason, many doctors will opt not to remove pigment alone from moles.