Oxybenzone and similar cancer-causing chemicals in sunscreens contribute to the minority view that sunscreens actually cause more and deadlier cancers than they prevent. Several small studies have found an increased risk of malignant melanoma, by far the deadliest form of skin cancer, among regular users of sunscreens.
An online sunscreen guide.
And finally a bit of snark:
Total UV protection is within reach and has been used for millennia. It's called clothing.