I have a large-ish sunspot on my face. Been checked by a doctor & assured it’s sun damage (admittedly not great but at least nothing worse). I use SPF50 - by Coola - and always wear a wide-brimmed hat even on sunny winter days in the garden. But I’m wondering if there is a better sunscreen specifically to prevent further growth or darkening of sun spots & even possibly lighten them? I’m 50 with dry skin so need a product for mature skin. Don’t mind paying for more expensive versions as long as they work!