There is a relationship between blepharitis and allergy, but allergy is not the only cause of blepharitis. Blepharitis occurs in association with impaired lipid metabolism in the lid margins. Allergies cause the skin of the eyelids to be unable to metabolize fat, fat accumulates in the lid margins, and bacteria and other infections of the eyelids break down the fat into fatty acids, stimulating inflammation of the lid margins. Thus, blepharitis is related to allergies. Allergies are not the only factor in blepharitis; deficiencies such as B vitamins and bacterial infections can cause blepharitis. If symptoms such as itchy and flaky eyelid margins occur, blepharitis may have occurred, and it is recommended to seek prompt medical treatment and choose medication and treatment under the guidance of a doctor.