Black lumps in the white eyeballs may be caused by scleral pigmentation spots, which is a normal physiological phenomenon, and may also be caused by pathological factors such as contact with foreign body staining and conjunctival pigmented nevus, which is an abnormal situation and requires timely medical treatment. 1. Scleral pigmentation spots: black lumps in white eyes may be scleral pigmentation spots, which refers to some brown or black pigmented spots appearing on the anterior surface of the sclera, which is usually caused by physiological factors, and with the growth of age, the sclera will become thicker, and the color will gradually become lighter or even disappear. 2. Foreign body staining: black lumps in the white eyeball may also be caused by iron filings or other foreign bodies entering the eyeball, which need to be removed from the eye in time, otherwise it will cause eye infection and damage. 3. Conjunctival nevus of pigmentation: it may also cause black lumps in the white eyeball, and it is irregularly round, of different sizes, slightly elevated on the conjunctival surface. Conjunctival nevus is a kind of congenital benign malignant tumor originated from neural ectoderm, which has the possibility of malignant transformation and needs to be surgically removed if necessary. After eliminating physiological factors, it is necessary to consult a doctor to find out the cause and take therapeutic measures under the doctor’s guidance to avoid delaying the condition.