Hi,as you already know that your skin is sensitive to UV rays (UVA and UVB rays) you have to protect your skin with clothing,sunscreen with min.of spf30 and if going out in the sun you can use SPF 50 and always apply sunscreen 20min.before stepping out between10 a.m.-4p.m.(peak hours)and reapply it every 3hourly if you are outside.
Take vit.c (antioxidant) orally as in recent studies it helps in sun protection.
Next Steps
You can consult cosmetologist or dermatologist for proper explanation and few more tips.
Health Tips
Try to cover your sun exposed skin and can use physical sunscreen which will protect your skin for longer duration only drawback is your skin will look whitish.