Eyelid dermatitis??

I have had a red, flaky, itchy rash on my eylid for about 3 months now. I have changed my makeup, lotion, shampoo, detergent and it is still there. I take benadryl for the swelling and the itch. Some days it doesn't look as red as others. I can not figure out what I am allergic to. Can stress do this? I feel... show more I have had a red, flaky, itchy rash on my eylid for about 3 months now. I have changed my makeup, lotion, shampoo, detergent and it is still there. I take benadryl for the swelling and the itch. Some days it doesn't look as red as others. I can not figure out what I am allergic to. Can stress do this? I feel like I am the only one in the world with this problem. Any advice??
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