A true expert would not deny the dermatologists. As a person who has scars on my body from the removal of pre-cancerous (thank the Lord) skin lesions, I say be careful with the sun.
And, FWIW, several years ago my GP advised me to stop taking calcium supplements as my blood work was showing abnormally high, and potentially dangerous, calcium levels. The Dr. said most people get adequate calcium through a healthy diet.
Well then you just proceed to follow their directives and avoid the sun at all costs. Glam on sunscreen before leaving the house, long sleeve shirts and wide brimmed hats.
The costs are plenty.