pale spot的用法和樣例：
例句
- Vitiligo is a chronic skin disease that causes loss of pigment resulting in irregular pale patches of skin.
白斑是一種慢性疾病，致使缺少色素，使皮膚產(chǎn)生不規則的白色斑塊。 - Until now he had been too much ashamed of his pale and meagre body, with the varicose veins standing out on his calves and the discoloured patch over his ankle.
他的身體好生蒼白消瘦，腿肚子青筋畢露，膝蓋上長(cháng)了白斑，這副德行，一直叫他免不了自慚形穢。
