Thanks for writing to us.
Your doctor might be right with his diagnosis of sunburn
. Another possibility could be contact dermatitis
due to exposure to any allergen or use of new cosmetics etc. if there has been an exposure to sun for prolonged time than we could think of all these symptoms bein sun induced
To treat the same
Use a good sunscreen, avoid sun as much as possible
Apply a steroid cream like mometasone
twice in a day
Take oral antihistamine like cetirizine
She might require a course of oral steroids
for the same a doctor's prescription will be required.
Hope that helped.