Ellie,
I am not sun sensitive (I think the stats are about 40% of lupers) so using sun block (neutrogena) works fine for me. Played golf on Tuesday and was out in the sun for 6 hours without a problem.
My case was extreme and complicated. Lupus hit me hard but polymyositis crippled me.....I was a quad and could not swallow. As far as I have determined no one has ever recovered from such an extreme loss of muscle (40 lbs in a week). Even so, I have probably lost 35-40% of my muscle cells so what has come back is the remaining 60-65%.
Some people who are sun sensitive do manage with sun protective clothing and sun block but others react to almost any sun exposure. I was lucky that was not one of my problems since I hike, play golf, and ski.
Bill