While winter brings shorter days as the Northern Hemisphere tilts away from the sun, the sun’s rays remain ever-present. Ultraviolet (UV) radiation from the sun or artificial sources can damage skin year-round by resulting in premature aging and adversely affecting the DNA in skin cells. Ultraviolet ray exposure is also cumulative, which increases the risk of skin cancer over time. Ultraviolet B rays are responsible for producing sunburns and are most often the cause behind skin cancers such as malignant melanoma; whereas ultraviolet A rays are always present, penetrating skin more deeply and causing photoaging.