Sunscreen is vital to protect your skin from the sun, but it can also cause adverse effects. If you have sensitive skin, finding a sunscreen that doesn't irritate your skin can be challenging. Sunscreen can cause acne, redness, burning or itchy skin, or dry skin.
Also, note that physical sunscreens using Zinc Oxide or Titanium Dioxide are the only ingredients recognized as generally safe by the FDA. That does not mean that chemical sunscreens are inherently dangerous, but if you are worried about the negative side effects of sunscreen, it is safer to use mineral sunscreens.