Need to know whether it is solar urticaria or it is polymorphous light eruption. Without examination of the skin condition and knowing the extent of involvement.. along with this more information on ongoing medication or previous history of skin illness it is not possible to comment on the treatment that would suit you best. Please get the problem checked thoroughly by visiting a qualified dermatologist or you can send images online through private online consult for a better assessment of the problem. Hope this is helpful.