What does it mean if there is a mole inside the left double eyelid?

Nevus generally refers to congenital localized abnormal skin changes. Most are present at birth, and a few appear after birth. Mostly persistent. Those dominated by melanocytes are called pigmented nevi; those dominated by vascular abnormalities are called vascular nevi (birthmarks); those dominated by epidermal hyperplasia are called verrucous nevi, etc. Nevus in a narrow sense refers to nevus cellular nevus composed of nevus cells. Because they mostly contain melanin, they are called pigmented nevus. If you're a bit superstitious, this mole actually represents good luck.