Skin problem. My skin from sun burnt.

Hi sir/mem my home is in Assam and i live in Delhi, but whenever i visit Bihar my face skin get burnt,my face skin turns to black, jahan jahan dhup lagta hai jaise ki hath me face me wo jagah kala pad jata hai and also the face skin irritates,but in delhi my face skin remains very good,white and glowing face, i used to go in sun light in day but nothing problem occurs in Delhi or Assam but whenever i visit Bihar my face becomes black in 2 days so i visited to a skin doctor he prescribed me below medicines-1.Lutiderm,2.Emoderm,3.cap Goldrush..but these creame are used at night so i want that creame which i can use at Day while going outside that prevents my skin from becoming black and also from sun burnt, i used lakme sun protect creme spf50 but no result so i want that creme that i can use when i goes outside in the sun light in Bihar that protects my skin from sun burnt.