His unique appearance leads to discrimination by his peers.
他独特的外表引来了小伙伴的歧视。

What appearance is the symptom of cerebral concussion?

脑震荡的症状是什么样子的?

N-COUNT. 形状;外形;轮廓;样子. The shape of an object, a person, or an area is the appearance of their outside edges or surfaces, for example whether they are round, square, curved, or fat.
N-COUNT. （通常指通过专业人士作出的）外表的改观，美容，改头换面. If a person or room is given a makeover, their appearance is improved, usually by an expert.

He made a sudden appearance.

他突然出现了。

※Appearances are deceitful. 人不可貌相，海水不可斗量。
※Judge not according to the appearance. 不要以貌取人。
※Never judge by appearances. 人不可貌相。