What's the difference between acne and blemishes? aren't they the same thing?

I'm trying to decide which St. Ive's product to buy. One says it's for oily/acne prone, and the other says oily/blemish prone.

Blemishes are imperfections, which can be basically anything, I guess.
Acne is more specific.

Blemishes are any kind of minor imperfection, and acne is more like pimples. So, acne is a type of blemish.

If you break out a lot, with a lot of spots and pimples, you're probably more acne-prone. If you experience some minor pimples here and there every once in a while, along with some whiteheads or small spots, you're blemish-prone.

acne is a real skin condition. a lot of people who think they have acne don't really, just because they have pimples

pissed me off when someone was whining and said, OMG I HAVE ACNE [with one pimple].
acne is something you deal with everyday of your life. a blemish is a little problem you deal with once a month basically

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