区分鸡眼和老茧。 使用非处方药。 用水杨酸贴片除鸡眼。 用水杨酸对付老茧。 用含有45%尿素的外用产品。 使用浮石。 泡脚。 保持皮肤湿润。

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
Corns and calluses are not the same thing, therefore the treatment approaches are different.  A corn can develop between the toes, has a core, and can be quite painful. Corns also develop along the tops of the toes, most often located just above a joint in the toe.  Corns are categorized as hard, soft, or periungual. A hard corn most commonly develops on the top of the toe and over a bone joint. A soft corn develops between the toes, usually between the fourth and fifth toes. A periungual corn i