: White patches on skin that keep growing gradually I did an online search and found out that it could mean vitiligo. But is there any other medical condition that could give the same symptoms? Thank you for your help

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"White patches on skin that keep growing gradually" Disease conditions mistaken for Vitiligo:

Idiopathic guttate hypomelanosis.

multiple, rounded or tear shaped light colored patches that appear on
the body parts that are exposed to sun. Like limbs, shin and forearm.

From WebMD:

affects fair-skinned people at a younger age........discrete, angular
or circular macules that are 1-3 mm in diameter. However, lesions may
measure up to 10 mm in diameter. These lighter-than-normal skin
macules are off white, hypopigmented, or achromic

Progressive macular hypomelanosis.

easily identified using a Wood's lamp. The lack of pigment results and
a clear observation of homogeneous white areas, while the involvement
of propionibacterium Acnes will show an orange fluorescence due to its
coproporphyrin III. That way it can be differentiated from other
hypopigmentary disorders such as vitiligo

Nevus anemicus.

it is characterized by skin patches which are of different size and
shape. They are paler than the normal skin.

Conditions with similar symptoms to Vitiligo:

Pityriasis alba, Tuberculoid leprosy, Postinflammatory hypopigmentation, Tinea versicolor, Albinis, Piebaldism, Idiopathic guttate hypomelanosis and Progressive macular hypomelanosis.