Sun exposure is linked to skin cancer, which is the most common type of cancer in the United States. It's best to limit sun exposure and wear protective clothing and hats when you are outside. Sunscreen is also very important. It protects your skin and will help prevent skin cancer. Make sure you use sunscreen year round on exposed skin (such as your face and hands). Choose a broad-spectrum sunscreen with at least an SPF 15 and one that blocks both UVA and UVB light.