It would likely be a condition called vertiligo. .a pigment disorder.
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Small white circles are probably sebaceous cysts, also known as white-heads. Larger white circles could be frostbite scars.
Some conditions cause white spots on the skin which can only be diagnosed by a doctor. Usually, the white spots on skin are simply an area where the skin is absent of pigmentation/melanin.
Vitiligo is often seen are face, neck, waist, limbs, armpit, anal area, and female genital area. Occasionally there can be hairs that turn white in the affected parts of severe cases.