Sometimes people have allergies to other things that come
in contact with other parts of the body but show up on the sensitive skin areas, like the
eyelids. For example, my wife is allergic to the gloves they use at our hospital. The reaction, however showed up on her eyelids instead of her hands. As soon as she stopped using thos particular gloves, the irritation went away. Process of elimination works best when it comes to skin allergies. It could aslo by Psoriasis or Eczema.