Niacin deficiency can also cause an eczema type of skin eruption with brown pigmentation, largely on the face, forearms and legs.

烟酸缺乏症也可以引起皮肤上的爆发在很大程度上与棕色色素沉着，面对湿疹型，前臂和腿部。

youdao

Niacin deficiency can also cause an eczema type of skin eruption with brown pigmentation, largely on the face, forearms and legs.

烟酸缺乏症也可以引起皮肤上的爆发在很大程度上与棕色色素沉着，面对湿疹型，前臂和腿部。

youdao