My left eyelid sometimes gets swollen and bumpy almost like I have several mosquito bites. I have been to 2 dermatologists and they have ruled out blepharitis and said it is just contact dermatitis (how totally vague). When I asked what is causing the allergy they said it could be formaldehyde in my nail polish or something else that I am touching and then rubbing/scratching my eyelid. My question is why is it only one eyelid? Anyone else have this problem?