I used to get these itchy hive-like bumps on my chest when out in the sun shirtless. I also thought I was "allergic to the sun" (though I'm not pale. Italian descent). 
Now you're making me realize this didn't happen this summer, and this also happens to be the summer that I started avoiding seed oils...
I'm not ready to call that conclusive just yet, but it sure is an interesting correlation.. 

 ...and just wait until you try a carnivore diet!..😯😎🥰