Photosensitivity reactions do have both genetic and immune related components. They may actually be persistent just like other forms of hypersensitivity or allergic reactions.It is important that your child will always have to be well protected from the sun. Also, is your child taking any medications or applying any creams,lotions that may seem to aggravate the condition once she's exposed to the sun?There is such a thing as chemical photosensitivity.
Corticosteroid application and gradual desensitization with UV phototherapy are usually used to alleviate photosensitivity reactions .Discuss with your child's physician if these forms of therapy may benefit children of this age group.