Even when wearing long sleeves, I put hair ties around my cuffs so I don't get a triangle of arc burn on my wrists. Then I wear safety glasses under the hood to mitigate reflected flash from the back wall into the helmet. If you're not comfortable, you won't weld as well. I live in the desert and still wear long sleeves in the summer when welding. The ones who advocate sunscreen are likely not doing very much welding, if any at all.