It can take a bit of trial and error to find the right product for you, especially if you have sensitive skin. I always tell my patients to test products on a small area of skin for a few days before using them on larger areas. To do this, apply a small amount of the product to an easily accessible area like your forearm. If you don’t notice any reaction after a few days, it should be safe for you to use regularly.
When it comes to sun protection, I recommend going with a physical blocker if you have sensitive skin. This type of sunscreen uses minerals such as zinc oxide or titanium dioxide to block the sun; the minerals sit on top of your skin to reflect the sun’s harmful rays away so they are not absorbed. With chemical sunscreens—the other type—ingredients such as oxybenzone and avobenzone get absorbed into the skin; in rare cases, they can cause an allergic reaction.
When it comes to your skin, prevention goes a long way. As a skin doctor I can tell you that the sooner you implement a proper skincare routine—which should also include regular visits to a dermatologist to check for sun spots and other potential signs of skin cancer—the healthier your skin will be in the long run.