A sixteen-year-old girl has white patches appearing on her face.

White patches appearing on the face of a 16-year-old girl may be caused by conditions such as pityriasis alba, vitiligo, or pityriasis versicolor, and treatment should be targeted according to the specific cause. Detailed analysis is as follows:

1. Pityriasis Alba

Pityriasis alba commonly occurs in children aged 3–16 years and frequently affects the face and upper arms. It may present as white patches on the face with slight scaling around the edges, usually without pain or itching. Under a doctor's guidance, topical treatments such as vitamin E cream or urea ointment can be used to relieve symptoms.

2. Vitiligo

Vitiligo is generally associated with reduced melanin production and commonly appears on the face, neck, and hands. The white skin patches caused by vitiligo are typically milky white with well-defined borders during the stable phase, and may sometimes be accompanied by itching. As directed by a physician, topical medications such as hydrocortisone butyrate cream or tacrolimus ointment may be applied for symptom relief.

3. Pityriasis Versicolor

Pityriasis versicolor commonly affects the face, neck, and upper arms. Skin lesions may appear brown, light red, or white, with a surface covered in fine, dandruff-like scales, leading to the appearance of white patches on the face. Under medical supervision, oral antifungal medications such as itraconazole capsules or fluconazole capsules may be prescribed for treatment.

In addition to the above relatively common causes, other possible conditions include anemic nevus, hypopigmented nevus, and albinism. If any discomfort or unusual symptoms occur, prompt medical evaluation and timely treatment are recommended to avoid delays in managing the condition.