White patches/Vitiligo on mouth/lips can be caused by many skin disorders and diseases, and may become a cause of serious concern for the patient having it.

Many patients with white patches inside and around the mouth are diagnosed with a skin pigment disorder known as Vitiligo. A person having Vitiligo may show discolouration of skin at many different locations including face, body, armpits, legs and even the eyes. With dark skinned people, the white blotches are much more noticeable.