Did I get sun poisoning? How do I get rid of the discolor? Will this always keep coming back? :( (photo)

Last summer I got burned in the sun and peeled extremely bad afterwords leaving my face, especially my forehead, red and sensitive. My skin felt very thin and I knew that I forced the peeling process too soon and my skin was not ready to come off-huge mistake. Now, every time I go in the sun a couple days later my forehead will peel and become discolored. A combination of dark and light spots-but just my forehead no where else. My whole life I have never had a problem with the sun until this:(

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