Allergic blepharocutaneous dermatitis is actually a localized form of facial dermatitis, an allergic disease that is prone to recurrence and is more severe, but has no significant effect on the patient’s vision. Allergic blepharocutaneous dermatitis is mostly caused by an allergic reaction of the eyelid skin to some kind of allergen or chemical substance, usually related to external material stimulation and contact, such as medication, chemicals, cosmetics, etc. The patient may have symptoms such as redness, swelling, rash, blisters, vesicles, itchiness, burning sensation and so on, and it is prone to recurrence, which usually makes it a more serious skin disease. If allergic blepharitis is not effectively treated in time, patients may develop complications such as secondary infections, eyelid pigmentation, and skin roughness. Patients need to look for allergens and avoid re-exposure, as well as use anti-allergy medications such as loratadine tablets as prescribed by the doctor. It is recommended that patients with allergic blepharitis consult a hospital in a timely manner to assess their condition and follow the doctor’s instructions for treatment to avoid delays.