What is the reason for the white spots on a child's body?

Patient's question:

No symptoms at all, no pain or itching, just like normal skin, just lighter in color
It has been there for a long time, but recently I noticed more of it

Doctor's answer:

Hello, the most common skin depigmentation disease in children, commonly known as "mole spots," has an unknown etiology and may be related to nutritional deficiencies, such as a lack of vitamin B. In medicine, it is referred to as a skin condition called "pityriasis alba." Pityriasis alba most often occurs on the face, but in some cases, it may appear on the neck, shoulders, and upper arms. The number of spots varies, and they are usually round or oval in shape.
There is also a condition called vitiligo, which is an acquired skin depigmentation disease with an unknown etiology. It may be related to genetics and autoimmune reactions. Pityriasis alba is different from vitiligo because the skin affected by vitiligo has no pigment at all, making it very white, with very clear boundaries between the affected and normal skin. The surface is also free of scales, and it does not necessarily occur on the face.
It is recommended that you take your child to the hospital for a specific examination.