Chronic sun exposure is the biggest factor in developing actinic keratosis. Therefore it makes sense to avoid the sun as much as possible. If some of the risk factors apply to you (advanced age, male, lighter skin tone, weakened immune system, history of AK or skin cancer), you should be more careful and be quicker to see a doctor. Avoidance is the most common sense and effective advice. Stay away from the outdoors when the sun is high. This isn’t always practical or even possible but everyone should be aware and take steps to simply avoid it. It can also be wearing long sleeves, high brimmed hats, or simply staying in the shade. However, sunscreen is usually the most practical way to protect your skin from UV light when your skin is exposed. The quality of sunscreen certainly matters, but the most common problem is that very few people actually use the sunscreen on a regular basis.