(1) Albinism is a hereditary disease that develops from childhood. It is characterized by whitening of the skin all over the body, white or yellowish hair, lack of pigment in the eyes, and photophobia.

(2) Leukodystrophy is most common in children and adolescents, mainly on the face, but also on the neck, upper arms and shoulders. The manifestation of flaky white spots, the edge is not too clear, the surface of the spot has grayish chaffy scales, mild itching.

(3) senile white spots is a senile degenerative phenomenon. Mostly seen in middle-aged and elderly people over 45 years old, and increase with age. It occurs on the trunk, limbs, especially the thighs, and does not occur on the face. The white spots have clear boundaries and are the size of a pinhead to a green bean. The skin at the white spots is slightly concave, and there is no increase in pigmentation at the edges.

(4) lichen planus is mostly seen in young people, mainly on the chest, back and neck. Beginning for light brown pin head to rice grain size spot, the surface of a few fine chaff-like scales, skin lesions in the process of fading white, so you can see light brown spots and white spots and see. Take the scales microscopic examination can be detected mycobacteria.

(5) Anemia nevus also develops since childhood, and it occurs on the face, neck, trunk or other parts of the body. There is no deepening of pigmentation at the edge. Pat and rub the local, light-colored spot itself does not redden,

SORRY,I don't know specifically