Thanks for writing in.
The condition you are describing can be photodermatitis.
Effective oral and topical medications are now available for photodermatitis .
My advise to you would be to use topical hydrocortisone cream
with good moisturizer.
Sun exposure can aggravate photodermatitis.Keeping the sunprotection is important to treat hyperpigmentation
. Use sunscreen with SPF 50.
Consult a good dermatologist
who can provide you with these options along with effective oral prescription medicines.
Hope this helps.