Thank you chrisboman, he's perfectly well now. He had to have two surgeries, the final one was "Mohs," but it's gone and he uses a strong SPF now. My husband and I use a sunblock that we get through the dermatologist. I'm reading your article at the link, and it's interesting. Most products that use Retinol have warnings about sun exposure, so it's really interesting to learn that some sunblock products use it. (I'm going to research more on that.)