A small bump protruding from the eye is usually caused by blepharospasm or pterygium, which needs to go to the ophthalmology department of the hospital and be examined by a doctor using a slit lamp microscope to diagnose the specific situation. 1. Blepharospasm: It is a relatively common cause, which occurs in the elderly, and is related to the degeneration and proliferation of conjunctival tissues after aging, which is generally not hazardous to the health of the eyes, and can be left untreated if there is no discomfort. 2. Pterygium: it is caused by aging phenomenon or bad stimulation, such as wind and sand or bright light stimulation, causing conjunctival lesions, if the volume is large, it may cause astigmatism or cover the cornea, thus affecting vision, and need to be removed through surgery. If a small bump in the eye has caused vision problems, it is recommended to consult a doctor and follow medical advice.