zit vs pimple

The core difference

Register, not meaning. Both name the same thing.

• pimple — the ordinary word, usable in almost any context.
• zit — slang, chiefly American, distinctly casual.

What clinicians say instead

Dermatology distinguishes what everyday English lumps together:

• Comedo — a blocked follicle. Open is a blackhead, closed is a whitehead. The dark colour of a blackhead is oxidised pigment, not dirt.
• Papule — a small raised bump with no visible pus.
• Pustule — a papule containing pus. This is what most people mean by pimple.
• Nodule and cyst — larger, deeper and more likely to scar.

Acne is the condition; a pimple is one feature of it.

The regional words

British and Irish English favour spot, which Americans generally do not use this way. Zit appears in American slang in the 1960s with no agreed origin. Australian English has pimple as standard and uses plook in some regions, a word also found in Scotland.

Where pimple comes from

Middle English pimpel, of uncertain origin, probably related to an Old English word for a swelling or blister. It is one of a small group of body-related English words with no clear ancestry — the etymological record simply runs out.

The one useful piece of received wisdom

The advice not to squeeze is not merely aesthetic: forcing the contents can push material deeper into the skin, worsening inflammation and increasing the chance of scarring. That much is consistent across dermatological guidance.