Other predisposing conditions include Plummer-Vinson syndrome and palmoplantar keratoderma.

其它诱发因素还包括Plummer-Vinson综合征、掌跖角化病。

Palmoplantar keratoderma is a rare disease where thick patches of skin develop on the hands and feet.

掌跖角化病是一种罕见病，患者的手脚会出现增厚性斑片。