Hello,
Welcome to the ehealthforum and I am really glad to help you out.
Since you had actinic keratosis which are directly related to exposure to the sunlight, so it is best to use a sunblock which is non perfumed and with minimum spf 30 atleast half an hour before going out in the sun. You can also cover your face with a thin cotton cloth while going out in the sun or avoid peak sunhours.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care.