Actinic (solar) keratosis

I expect many gransnetters have had this condition as it is fairly common.
Can I ask how it was treated and how effective it was?
DS has been told he has this on his scalp. He is a real worrier and was very upset that the doctor said it was pre-cancerous.
Of course it is, and he needs to know.

He is using diclofenac cream which is a drug of choice for a small area, but whatever I say to reassure him makes things worse. He has contacted the doctor and is going back to discuss it next week.

I often find Google reassuring if you look at trusted sites, but he and d-i-l don’t, and never research health problems.