Greetings. There can be few medical conditions associated with such presentation and should be ruled out by meeting a Dermatologist. You could be having photosensitivity. The information provided is limited. A thorough history and clinical examination will be helpful. A photograph will add in obtaining better recommendations.
Next Steps
Your dermatologist will decide a treatment plan for you after a consultation.
Health Tips
Consider usage of a broad spectrum Sunscreen to filter the harmful UV rays.