###Human: Why is there a skin patch on my lip that gets white and dries out? ###Assistant: Hello. It seems like Pityriasis Alba which is patchy post inflammatory hypopigmentation, usually on the face, in those who have dry skin or are atopic. I suggest you use Tacrolimus 0.03 % ointment, twice daily. Rub it in. Do you use a moisturizer on your face? How do you wash your face? Do you have any allergies?