I too spoke with my Hematologist and again asked about the sun mainly for the preferred way to get vitamin D.
I was told 10-15 minutes a day, use common sense and don't overdo..However sun is not out everyday, If it is I go out before noon and I see a dermatologist every 6 months...I have PV, everyone is different, I noticed a flushing after sun exposure which goes away quickly, I strickly stick 10-15 minutes in the sun..Everyone is different, check with your Doctor first...