What best explains the metaphorical meaning of blue skin in the poem Masks by Shel Silverstein

Which statement best explains the metaphorical meaning of blue skin in the poem "Masks"? In the poem, only two people in the whole world have blue skin, which means that they must be soulmates. In the poem, blue skin is such a common trait that people must wear masks in order to appear unique.
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Positive people generally have more of the ability to see the good in things in a bad situation, more self confidence, lift others up to attain a goal, stay focused on the goal at hand and see all experiences as learning experiences.

Negative people usually are less confident, pessimistic, feel greed and suffering is the leading factor for almost everything and rely on luck then doing work to do a goal.