"our findings indicate that sunscreens plus DNA repair enzymes may be superior to traditional sunscreens alone in reducing field cancerization and UVR-associated molecular signatures (CPDs) in AK patients, potentially preventing malignant transformation into invasive squamous cell carcinoma in a more efficient manner."
courtesy of https://www.ncbi.nlm.nih.gov/pubmed/26355618
*wear a large brimmed hat, polarized sunglasses, & sun protective clothing
*use your sunscreen & reapply every two hours. Reapply sooner if you've sweated a lot.
*avoid the sun when it is at its highest point in the sky, usually 11:00-15:00
*skip the tanning beds
*schedule yearly skin exams
*use a UV laundry detergent to boost protection