swelling

Compared meaning: a small raised lump on the body's surface (noun).

比较义项：身体表面凸起或肿起的小肿块（名词）。

• bump

  Informal word for a small lump that appears after a knock or minor injury; suggests an everyday accident rather than a medical condition.

  口语化用词，指因磕碰或轻微受伤而鼓起的小肿包，暗示的是日常小意外，而不是医学问题。

  He bumped his head on the shelf and got a bump the size of an egg.

  他的头撞到了架子上，肿起了一个鸡蛋大小的包。

• swelling 本词

  Neutral, often medical term for a part of the body that enlarges from fluid, inflammation or infection; common in clinical or health contexts.

  中性、偏医学化的说法，指身体某部位因积液、发炎或感染而变大，常用于临床或健康语境。

  The nurse checked the swelling in his ankle and said it wasn't serious.

  护士检查了他脚踝上的肿胀，说情况并不严重。

• bulge

  A rounded lump that pushes out from any surface, not just skin; often describes an object or wall rather than an injury.

  指从任意表面鼓起的圆形凸起，不限于皮肤，常用来描述物体或墙壁，而不是受伤。

  There's a strange bulge in the sofa cushion where a spring broke.

  沙发坐垫上有一处奇怪的隆起，是弹簧断裂造成的。

Bump, swelling, and bulge can all mean a small raised lump. Bump is informal, from a knock. Swelling is a neutral, medical word for a body part enlarged by fluid. Bulge is not limited to the body; it can be any surface pushing outward.

这三个词都可以指表面鼓起的小肿块，但语气和适用场合不同：bump 多指因磕碰而鼓起的小肿包，说法随意；swelling 是更中性、偏医学化的说法，指身体某部位因积液、发炎等原因而变大；bulge 不限于身体，也可以指墙壁、口袋、沙发等物体表面鼓起的一块。