If you are in a hurry and want to get rid of the unsightly stain, you can learn how to cover upper lip shadows with makeup too. Now you know how to remove a female moustache shadow or upper lip shadow, you may want some tips on how to lighten a female moustache or how to bleach a female moustache naturally.he causes of moustache shadows often result from bad habits such as overexposure to the sun or routines that change your hormonal balance. Next, at OneHowTo.com we'll explain the most common causes of a dark shadow on the upper lip. 1  One reason is due to plucking or waxing, without applying sunscreen.