welcome to HCM.
Your skin condition might be a contact dermatitis
. It can be due to an air-borne allergen, Photo allergen, insect bite...
You need to identify and avoid allergens.
You could wear full sleeve to cover your arms and protect yourself from intense sunlight. You can use sunscreen cream(e.g. spectraban) to protect your face from sunlight.
You could visit a dermatologist
for diagnosis and management of your skin lesions.