Do you know which type of sunscreens you should be using? As I had mentioned in my posts at @drnaghmehpharmd, its best to use physical sunscreens ( zinc oxide). Chemical sunscreens contain "oxybenzone", a synthetic estrogen that penetrates the skin and can disturb the hormone system ( specially in females). Try to look for sunblocks that have zinc oxide or titanium dioxide that are safe.
