尽管雪鼻是唯一最终颜色可以恢复的，但并不是导致鼻子失色的唯一原因。

Snow nose isn't the only condition that can cause the nose to fade, although it is the only one in which the color eventually comes back.

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有些兽医认为甲状腺水平过低是导致雪鼻的原因，但并没有证据可以证明这一点。

There is no evidence to prove that it is true, but some vets believe that low thyroid levels can cause the nose to lose its color.

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