Long spots under the eyes may be caused by long-term staying up late, seborrheic keratosis, cirrhosis of the liver and other factors. 1. Long-term staying up late: Long-term staying up late may cause the normal function of endocrine and nervous system to be dysfunctional, which may lead to dry skin, no luster and black spots under the eyes. 2. Seborrheic keratosis: also known as age spots, mostly seen in middle-aged and old people over 50 years old, may be related to heredity and sun exposure, easy to appear in the eyes, limbs, chest and back and other parts of the spot of varying sizes, usually no pain. 3. Cirrhosis of the liver: it may lead to impaired liver function, sex hormone disorders, etc., which may cause pigmentation, resulting in black spots on the eyes, neck, chest and back. Normally, you should develop good habits of work and rest, and if the area of the spots is relatively large or accompanied by other uncomfortable symptoms, you should consult a doctor in time so as to avoid delaying your condition.