White bump on eyelid?

Hard to say.: Milia or xanthelasma if many. Chalazion or hordeolum if on eyelid margin.

?possible stye?: Microwave a clean potato with the skin on for four minutes. Wet a wash cloth or small towel with warm or hot water. Squeeze out the excess water and wrap it around the potato. Apply this to the eye lid until it cools down (about 15minutes).This can be repeated intermittently. Please see your opthamologist if no improvement.

See a dermatologist: It is difficult to make a proper diagnosis since I am not there to see the condition. I recommend seeing a dermatologist so that they can make a proper diagnosis and give you something to get rid of the condition or relieve symptoms.