It seems your skin highly sensitive to sunlight and you have to avoid exposure to sunlight as far as possible. you can wear stockings, leggings and wear gloves to protect your hands and high collared shirts to protect your neck are always better. You can also use sun screening creams with SPF more than 15 whenever you go outside or if there is a chance to exposure to sunlight. These measures will protect your skin definitely. Now you can use moderate potent steroid
creams and multivitamin
tablets and mild toilet soaps with moisturizers with the advice of your Dermatologist
.. You will be free from all your symptoms soon.