它的确切原因不明，但它可能包括免疫反应。
Its exact causes are unknown, but it may involve immunologic reactions.
虽然确切原因不明，白癜风有时抵消了严重压力。
Although the exact cause is unknown, vitiligo is sometimes set off by severe stress.
确切的导致血管的恶化原因不明，但是看起来和血管中黑素细胞的缺乏有关。
The exact cause of this vascular degeneration is not known, but it appears to be associated with the absence of melanocytes in the blood vessels.
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