A 30-year-old female presents with depigmented patches on her hands that have progressively increased in size over the past year. She has no other symptoms. What is the likely diagnosis and how would you confirm it?
The patient's symptoms of depigmented patches on the skin that have gradually increased in size are suggestive of vitiligo. This condition is diagnosed primarily based on physical examination and the patient's medical history. However, a skin biopsy or a Wood's lamp examination (a special type of ultraviolet light) may be used to confirm the diagnosis.