Follow up with the dermatologist is a good idea, particularly if he has any history of skin cancer or is prone to actinic keratosis.

I have had several basal cell and squamous cell skin cancers removed from various parts of the body over the years, due to 20 years of competitive swimming before the advent of sunscreens. After treatment, I developed a spot that turned into a rather ugly looking growth, square in the middle of the radiation field on my upper chest. It turned out to be a low grade SCC skin cancer, which they removed with no issues. My RO explained that the radiation can act like years of sun exposure for people prone to skin issues.