Polymorphous Light Eruption (Sun Allergy) Remedies

This spring is the first I've ever experienced PMLE (Polymorphous Light Eruption), I would develop an itchy, red bumpy rash on my arms, legs and back of neck. The itchy rash would last for a few days, then reappear when exposed to the sun again. I started eating fish every day, sometimes twice a day. For two full weeks I ate breaded sole, canned sardines and canned smoked oysters (I wanted to increase my selenium intake). Happy coincidence, no more rash, no more itch.