Babies diagnosed with vitiligo generally need to be differentiated from the following diseases. The first is anemic nevus, which is a congenital hypopigmentation that often exists at birth. If you rub the skin in the affected area, it does not turn red, while the surrounding normal skin does. Another is achromic nevus, which appears at or shortly after birth, characterized by localized hypopigmentation that often follows the distribution of nerve segments, with blurry boundaries. Additionally, there is tinea versicolor, which tends to occur in hot weather, with hypopigmented patches that have a bran-like or scaly appearance and a positive fungal test. It also needs to be differentiated from pityriasis alba, also known as white pityriasis, which commonly appears on children's faces and has a slightly rough surface. Generally, vitiligo diagnosis still requires further confirmation through tests such as Wood's lamp, dermatoscopy, skin CT, and fungal examinations.