A small bump on the lower eyelash may be caused by blepharitis, folliculitis, skin warts and other reasons. 1. blepharitis: the patient’s lower eyelids appear swelling, blepharitis caused by the septic inflammation of the eyelid glands, the patient’s eyelids can appear red and swollen, but also photophobia, tearing, pain and other uncomfortable symptoms. In the advanced stage, the patient’s eyelid can also appear abscess, with the growth of time, there will be pus head, and finally broke. 2. Folliculitis: If the patient usually do not pay attention to eye hygiene, often with the hand rubbing the eyes, can lead to bacterial infection of the patient’s eyes, may cause folliculitis, the patient’s eyelash root can appear swelling, the patient can also appear eyelid pain and other symptoms. 3. flat warts: flat warts are a common skin disease caused by the papilloma virus, which is highly contagious and can occur in all parts of the human body. If the warts grow on the eyelid, a small bump may form on the edge of the eyelid. It is recommended that patients with eyelid swellings and other discomforts seek prompt medical attention to assess their condition and treat them under the guidance of a medical professional.