Once you apply the lotion and rub it in, and it has time to absorb, it is essentially like a 'dye' or stain for the skin (like wood stain). It colors the upper layers of the epidermis and after it absorbs it does not 'wash' off that easily. It fades as the outer layers of skin sloughs off cells and those cells are replaced from below with new, undyed cells.
Just follow the directions on the bottle and you'll be fine.
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