Saccade is not a skin jump, but the contraction of orbicularis oculi muscle and levator palpebralis muscle under the control of nerves, and the surface skin involved moves with it.
Eyethrobbing pain is called "eyelid tremor" in medicine, and there are two main reasons: first, insomnia or lack of sleep, eye fatigue, neurasthenia, anemia, excessive smoking and drinking, irregular menstruation and so on. The other is caused by some eye diseases, such as ametropia, conjunctivitis, keratitis and sty. We occasionally have saccades, mostly because of lack of rest or eating irritating food and some drugs. This kind of saccade does not affect health, and has nothing to do with good or bad. However, saccades occur frequently or last for a long time, and the saccades are large, so you should seek medical attention as soon as possible.