I have a sensitivity to tea tree oil. The eye doctor gave me a scrub for my inflamed eyelids with tea tree in it, and it burned like fire ants! Not just my eyelids, but my cheeks too. I also don't tolerate certain preservatives and conditioners and the detergent in baby shampoo. They make my scalp itch and irritate my eyelids. They didn't bother me in the past. Contact dermatitis is pretty common, even to things which never bothered you before. Hope your skin is feeling better. I was told by my allergy nurse to use a thin layer of over the counter (1%) hydrocortisone cream for reactions like that.