What causes a white patch on the face?

The appearance of a white patch on the face generally warrants consideration of the following conditions:

First, vitiligo—the most common cause. In vitiligo, the depigmented patches typically appear milky white, with surrounding skin slightly darker than normal. Additionally, the affected area may gradually enlarge over time.

Second, pityriasis alba—a condition characterized by pale, hypopigmented patches with fine, subtle scaling visible upon close inspection. It is usually asymptomatic and is thought to be associated, at least in part, with sun exposure.

Third, congenital hypopigmented lesions, such as nevus depigmentosus or nevus anemicus, which both present as white macules or patches.

Therefore, if you notice a white patch on your face, it is essential to consult a qualified dermatologist at a reputable medical institution for an accurate diagnosis.