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I have a reaction to sunscreen. I can put it on indoors and I'm fine. But the moment I step outside for 30 minutes or more, I get red and swollen, and then itchy bumps form. This lasts for several days after use, so now I don’t use any sunscreen. I've tried most of the sensitive brands, too. Am I just out of luck?
It sounds as if you are experiencing a photo-allergic reaction or photocontact dermatitis, meaning that the sunscreen product in combination with UVA/B rays causes you develop an allergic reaction.  Oxybenzone (benzophenone-3), the most widely used UVA blocking agent, is the most common cause of sunscreen-induced photo-allergic contact dermatitis. Other sunscreen agents known to induce photo-allergic reactions are the benzophenones, cinnamates, and dibenzoylmethanes.

Titanium dioxide and zinc oxide are inorganic filters which have excellent coverage for UVA1, UVA2 and UVB. I would suggest either one or a combination of these agents, as they will offer broad-spectrum protection with minimal irritation, sensitization, and skin penetration. Look for ones with the fewest added ingredients. Try to avoid fragrances. Although rarely used these days, always avoid PABA-containing products. 

Belly Buttons & Babies Sunscreen Lotion (SPF30) and Honest Mineral Sunscreen Spray (SPF30) both appear to fit the recommended criteria above, though I can’t specifically recommend either, as I have no personal experience with them.

You might also consider clothing products and hats that offer sun protection.

Your allergist can help with personalized recommendations and strategies.