What is Photo Dynamic Therapy and how can it help with actinic/solar keratosis? Fiona Clark runs through her experience with the treatment.   I confess, I am a sun worshiper, but it’s taken its toll on my skin. Back in the day, as they say,  when I was a child (think late 1960’s here) there was no sunscreen except zinc cream – a thick white paste that smelt awful and once you reached teenage years was not a great look. Consequently I spent most of my youth with a blistering nose and burnt cheeks and shoulders. Even when the clear…