What can cause a white dot on the inside of my eyelid?

White eyelid dot: A white dot along the eyelid margin is often a blocked oil gland or stye. Treatment is warm compresses and scrubs. If worsens or no improvement, you should see an eye doctor for further evaluation.

Oil gland: This is most likely the secretions of an oil gland but could also be a benign concretion. I am assuming this is something you see when you pull down the lid but feel nothing. If there are symptoms then have your ophthalmologist look at it.