I, I can understand your concern for mole on mole on lower eye lid of your mother. To tell you scientifically and medically regarding moles- We have with us the cells known as melanocytes in the skin which gives color to the skin. At some places these are naturally and genetically more in number. At these places these proliferates inside the skin and forms the moles. It may appear any time after birth and is more common in people with white skin. Generally these are not having any symptom and are seen as cosmetic problem only but some times these can be seen with caution. In your case you should meet a dermatologist or a surgeon to get it removed by radio-frequency ablation or by shave excision. All the best.