An examination is very important to say what you. It could be because of blepharitis. You should see an ophthalmologist to confirm it though. Lid hygiene is of utmost importance in this condition and lids should be daily scrubbed with diluted baby shampoo. An anti-biotic ointment like Teracycline should also be applied at bed time. To read more about this condition, you can follow this link - http://www.eyecarecontacts.com/blepharitis.html. Other possibilities include contact dermatitis, allergy etc. Thanks.
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