Itchy eyes after eyelash extensions may be caused by allergic conjunctivitis, contact dermatitis, blepharitis and other diseases, which need to be treated with general measures, medication and surgery for the cause. 1. Allergic conjunctivitis: typical symptoms are itchy eyes, foreign body sensation. Patients need to use cold towels for ice, under the guidance of the doctor using saline rinse conjunctival sac. At the same time, follow the doctor’s instructions for the use of topical antihistamine eye drops, such as emetine fumarate, levocabastine hydrochloride, etc., as well as lodoxamide, nedocromil and other mast cell stabilizers, or hydroxymethazoline, phenmetrazolium and other vasoconstrictors. 2. Contact dermatitis: the main symptoms are redness, swelling and itching at the contact site, which can be manifested as itchy eyes. It is necessary to remove the allergens in time, and use antihistamines such as loratadine and benadryl, and glucocorticoid creams such as dexamethasone and prednisone as prescribed by the doctor. 3. Blepharitis: the patient’s eyes will appear stinging, itching, swelling and other manifestations. Patients can use hot towels to the eye for warm compresses, and timely use of saline to wash the root of the eyelashes. Patients need to follow the doctor’s instructions to use glucocorticoid eye ointment, such as tobramycin dexamethasone ophthalmic ointment, hydrocortisone acetate ophthalmic ointment and so on. When there is a suppurating lesion in the eye, incision and drainage may be performed. Patients with itchy eyes after eyelash extensions are advised to go to the hospital and cooperate with the doctor to actively treat the original disease.