<qa>  What is the name of the drug that is applied to the upper eyelid margin?Bimatoprost applied to the upper eyelid margin for eyelash enhancement attempts to capitalize on the desirable effects of darker, longer, thicker eyelashes, while limiting more significant and undesirable effects through limited exposure of the drug to ocular tissues. This same concept may apply for dermatochalasis: at a metered dose, topical bimatoprost to the lid margin could lead to subtle periorbital fat loss resulting in improved dermatochalasis. 