A large lump suddenly grows under the patient’s eye, which may be a blepharocyst, lipoma, blepharitis and so on. 1. Blepharophalangeal cyst: If the patient’s blepharophalangeal gland gland ducts are blocked and the secretion fluid is not discharged smoothly, it is easy to form cysts, which may cause the patient’s localized protruding lump, and the symptoms of pain and itching are usually very mild. 2. Lipoma: Abnormal hyperplasia and differentiation of subcutaneous adipose tissue can form benign tumors, resulting in a large lump suddenly growing under the patient’s eye. 3. blepharitis: blepharitis refers to suppurative inflammation of the eyelid glands, patients can appear eyelid redness, swelling, pain and other uncomfortable symptoms, patients can follow the doctor’s instructions to use medication, such as tobramycin ophthalmic ointment. It is recommended that patients with a large lump under the eye and other discomforts should consult a doctor to evaluate their condition and follow the doctor’s instructions for treatment.