Start with 10-15 minutes exposure to the face, arms and legs, or the diseased area of the body daily under direct sunlight (not behind a window). Build up to 20-30 minutes daily. Avoid sun burning. Do not use sun block or suntan lotion, they have been proven to be carcinogenic.
To avoid the risk of skin cancer, eliminate all animal fats and heated vegetable oils (this includes almost all commercial oils). Consume your fats as they are found in nature (raw nuts, raw seeds, avocado, olives, corn, etc.).Eat plenty of vegetables and fruits which are rich in antioxidants that will protect your skin.