What is the typical symptom of leukoderma?

Leukoderma is characterized by the absence or lack of pigment in the skin. This condition leads to lighter patches or areas on the skin where melanin, the pigment responsible for skin color, is either reduced or absent. This is a definitive symptom, distinguishing leukoderma from other skin disorders where pigmentation changes involve darker or discolored areas.

In contrast, red patches on the skin indicate inflammation or conditions such as psoriasis or eczema, darkened areas of skin are often seen in conditions like hyperpigmentation or sun damage, and patches of scaly skin are commonly associated with conditions like psoriasis or fungal infections. Thus, the clarity of leukoderma being defined by a lack of pigment makes it the correct answer.