Thanks for the query,
You might have developed photodermatitis.
As you are developing lesions only in sun exposed areas.
Your description even looks somewhat similar to DLE.
Please get your blood ANA profile checked.
Apply a mild steroid
lotion like desonide
Also take an antihistamine tablet.
This will give you some relief.
Please meet a dermatologist
for exact diagnosis.
Let me know if you have any other doubt.
you can ask a direct question to me on this forum, following the below link.
Wishing you a good health.