Hi,
To prevent further UV damage, avoid further UV exposure, use protective gears (UV protective clothing, sun-hats, umbrella), and regular use of high-quality sunscreens. Oral sunscreens may give additional benefits.
To repair damage that has already been done, consider using prescription topical tretinoin and skin rejuvenation procedures. Effective skin rejuvenation procedures include chemical peeling, intense pulse light treatment and fractional CO2 lasering.
A full assessment by your preferred aesthetic doctor will help guide you in the choice of treatments that will address your photodamaged skin based on the severity, area of occurrence (e.g. face, neck or limbs), expectations, downtime tolerability and costs considerations.
Hope this helps!